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Abstract This paper contributes to the literature on empirical macroprudential policy (MP) stance assessment. The main purpose of this framework is to evaluate the potential benefits and costs of MP tools and instruments that have been employed in a financial system. We focus on a country that has a fairly active macroprudential policy to establish the initial framework for assessing the effectiveness of macroprudential policy in Croatia. A quantile regression approach is used in order to evaluate the efficiency of the MP stance, on quarterly data ranging from the mid-1990s until 2022. It is shown that somewhat different results could have been obtained if a variable definition has been employed. Measurement of the MP stance is difficult, then, as it depends on the definition of the macroprudential policy variable, selection of other important variables in the analysis, as well as other methodological factors.
Keywords: systemic risk; macroprudential policy; financial stability; financial conditions; quantile regression; policy assessment; macroprudential stance
JEL: E32, E44, E58, G01, G28, C22
1 Introduction
Today, most European Union countries have a fairly active macroprudential policy
(MP), which has received more attention since the Global Financial Crisis (GFC) (2021; 2021;2020). In the last couple of years,
empirical work started to focus on answering the question how effective this policy is,
and how its stance is to be measured. Compared to monetary and fiscal, macroprudential
policy is still relatively new, and much more work must be done to answer this question
(2021). To measure the MP stance, we should first define it. In 2019, ESRB
defined the MP stance as “the balance between systemic risk and resilience relative to
financial stability objectives, given implemented macroprudential policies; the stance
metric represents residual systemic risk in the financial system, relative to a neutral
level of risk considered sustainable in the long run”, and it establishes a relationship
between macroprudential policy actions and the financial stability objectives (2021 , 2019)1. This is a useful concept, as it could enable the policymakers to get a
better understanding of MP effects, it could foster better policy decision-making, by
reducing the policy inaction bias and would enable cross-country comparisons. Swedish authorities (2020) agreed that one of the problems in the EU context is the policy
inaction bias, and that the European Systemic Risk Board (ESRB) should make regular
assessments of the macroprudential policy stance across countries.
To measure the MP stance, literature 2 developed the Growth-at-Risk framework
(GaR), as it relates current macro-financial conditions in the economy and MP
measures to the entire distribution of the future GDP growth. One important aspect
that is looked upon here is the so-called tail risk, i.e. what the worst possible outcomes of future real growth are. This is important, as financial stability risks lie in
those tail risks, which we call systemic risk. Reducing these risks in the financial system could lead to a lower probability of a future crisis 3 , and MP could increase
the financial system’s resilience ( 2016). Thus, utilizing the
GaR approach to measure MP stance could help in obtaining information on how
this policy affects real growth, and macroprudential instruments could be tailored
accordingly. GaR framework can be used to estimate the inter-temporal trade-offs
of the application of MP instruments, as we can estimate the “benefits” of limiting
the extreme negative outcomes of future growth and compare them to the potential
“costs” of limiting mean future growth ( 2024). Several central banks
already started publishing this concept regularly in their financial stability reports
( 2019; 2022; 2018; 2022; 2019), regular IMF reports ( 2017) for earliest applications, or IMF ( 2022a) for latest), ECB reports
( 2019), and regular risk identification ( 2021). Besides
this specific characteristic of the MP stance assessment, the at-Risk approach also
has other benefits, such as better forecasting capabilities compared to linear models, and in generating scenarios, as well as calibrating them in stress testing ( 2020; 2023). That is why empirical research 4 that utilizes this framework has significantly increased in the last couple of years.
The purpose of this paper is to construct a GaR framework and empirically evaluate
MP effects and stance for the case of an active country with respect to this policy:
Croatia. To evaluate the MP stance, we collected quarterly data on selected macrofinancial variables, and the MP index that captures all of the instruments and tools
that have been used since the mid-90s to increase the resilience of the financial
system. Then, we employ quantile regression as the methodological apparatus to
estimate the GaR model for the Croatian case. There are two reasons why this
single-country analysis could be interesting for an international audience. Firstly,
GaR can be estimated either on a single-country basis, or in a panel quantile regression setting. The “one size fits all” approach in which countries are merged in
a panel setting is not always the best 5 . Certain specificities characterize individual
countries and their experiences over time, and a such information could be lost in a panel setting. Ampudia et al. ( 2021) list some other drawbacks of panel settings,
which include the high diversity in macroprudential measures across countries being truncated into simple indicators. Budnik et al. ( 2021) comment that panel GaR
estimation could be biased if time-invariant country characteristics are omitted from
the model. Moreover, research on the importance of structural 6 differences among
countries that affect the GaR results is growing ( 2022; 2022). Secondly, another reason is the unique experience of
Croatia’s macroprudential policy in the last 20 years: even in the pre-GFC period,
Croatia was among those countries that had a relatively active macroprudential
policy ( 2016). A lot of measures were employed to tackle
credit growth ( 2020), and higher activity of MP employing
different measures started in 2003 ( 2011). This means that the MP
stance assessment of Croatia includes an interesting period in which both tightening
and loosening measures were included. Not many countries have such data luxury.
The main findings of the paper show that it is actually difficult to evaluate the MP
stance, due to several reasons. The variable that captures the MP instruments that
are applied in practice has methodological challenges, as it captures many different
tools policymakers apply. The source of data collection for this MP variable also
matters, alongside how this variable is transformed and used in the model. The
majority of the results turned out to be insignificant. There is somewhat indication
that there could be positive effects of tighter MP today; however, the full results
are still inconclusive, as the change of the model specification results in different
overall interpretations. Future work should increase the number of observations
to re-evaluate what was done in this study or try to conduct a panel analysis with
countries in which MP was conducted in a similar way in the same period.
The rest of the paper is structured as follows. In section 2 we review literature
that is related to the empirical approach of this study, whereas in section 3 we talk
about some challenges in measuring macroprudential policy in practice. It is important to take this into consideration, as to measure the effects of MP, one needs
to correctly define the variable. The fourth section describes the methodology and
datasets used in this study and the empirical results are shown in the fifth section.
The final, sixth section concludes the paper with some recommendations for future
policy evaluation and empirical analyses.
2 Literature review7
The main focus of this research is empirical evaluation of the macroprudential
policy effects on future real growth, so in this section, we focus mostly on papers that are closely related. This stream of research is relatively new, and is still
developing. Thus, before analysing the main findings, we briefly review some of
the seminal papers that are important for this empirical framework. The size and
scope of related literature has increased significantly in the last couple of years
since then. Still, conclusions about the effectiveness of MP are that knowledge is
still limited due to a high degree of uncertainty (2018),
and a short history of the policy itself (2019). Nevertheless, the European
Systemic Risk Board (2019 ; 2021) started to develop a framework in which
the macroprudential policy measures are related to future GDP growth, based on
the definition of macroprudential policy and financial stability itself.
A few major conclusions emerge from the related work discussed below. Although
the number of papers that employ a GaR framework has significantly increased in
the last couple of years, only a small number of papers include the macroprudential
policy variable to assess the stance of the policy. The reasoning could be found in the
relatively short time series of the macroprudential policy indicator for some countries
and problems defining and measuring this variable. On the one hand, some countries
only have a couple of years of MPI data, which disables a single-country analysis.
On the other hand, MPI measurement problems could discourage some authors from
undergoing such analysis, as different results can be obtained concerning the definition
and transformation of the MPI variable. A lot of reviewed literature introduces countryspecific financial conditions or financial vulnerability indicators. Authors are motivated
by some specific dynamics, characteristics, and/or problems of a single country, and to
account for this, variables are modified to reflect this in the best possible way.
2.1 Initial contributions
Seminal papers that introduced the GaR concept within the macroprudential policymaking were actually focused on better GDP growth forecasting. The main motivation was
to enhance the approach of obtaining forecasts of tail risks of GDP growth, as models
applied in practice and empirical research did not take into consideration the non-linear
relationships between the macro-financial variables. Besides the usual variables that
can be used for GDP growth forecasts, specific financial variables were introduced to
facilitate the short-term forecasting, such as the financial conditions, financial stress, and
systemic risk indicators. All these measures have good short-term forecasting properties,
but they do differ in their nature. Financial conditions measures can be defined as the
ease with which finance can be accessed by non-financial corporations and households
(2021), systemic risk indicators can be defined as tools for identification of systemic events, defined as financial instabilities spreading to such an extent that they will
spill over to economic growth (2010); whereas financial stress indicators quantify
the degree of aggregate stress in the financial system, and have been found to have
short term predictability of an economic downturn (2023).
Giglio, Kelly and Pruitt ( 2015, 2016) examine the predictive power of many systemic
risk measures (like Covar, MES, SRISK, etc.) for the case of the USA and selected
advanced economies. The main focus was to obtain information on which measures
are successful in forecasting future GaR, with in- and out-of-sample comparisons.
Probably the most famous papers in this group are those of Adrian, Boyarchenko and
Giannone ( 2016, 2019), who argue that most growth forecasts are point estimates
and ignore the heterogeneity of different quantiles of future growth distribution. The
authors show that lower quantiles of future US GDP growth have greater volatility
when compared to the upper ones, which are fairly stable over time. Deteriorating
financial conditions are related to a decrease in future average GDP growth, with
low upside risks regardless of today’s financial conditions. This indicates a nonlinear
relationship between financial conditions and future GDP growth distribution exists.
2.2 Extending the framework
These previous studies include only the financial stress/systemic risk measures/financial condition indicators in the analysis, with short-term forecasting capabilities.
In order to talk about macroprudential policy stance, other indicators and variables
need to be included in the modelling process. This also will have consequences on
tailoring macroprudential measures. The inclusion of other important indicators that
are able to capture the policy itself could facilitate the analysis of the timing of the
MP effects. Aikman et al. (2018) thus provide one of first extensions towards this way.
The study used aggregated measures of financial vulnerabilities in the UK (leverage
in the private nonfinancial sector, asset valuations in property markets, and credit
terms) in the GaR modelling. The process of the selection of the best variables drew
on previous literature on early warning models and banking crises. The authors found
different effects on future GDP growth across different parts of the growth distribution
within the quantile regression approach, and the estimates were significantly different when compared to the OLS (ordinary least squares) estimate. As the results are
intuitive and straightforward to communicate, such an approach could be used within
macroprudential decision-making when looking at the results of such forecasting.
Other studies emerged afterwards, such as Plagborg-Møller et al. ( 2020), is an
extensive study of future GDP growth distribution forecasting in 13 advanced
economies, based on several nonparametric and parametric approaches, and a long
list of GDP predictors for monthly and quarterly data from 1975 8 to 2019. This
study covers a wide selection of in- and out-of-sample forecasts and nowcasts.
The authors found a great degree of heterogeneity of results, not just between the
countries, but between different indicators used within the same category for a
given country. Aikman et al. ( 2019a, 2019b) extend the Adrian, Boyarchenko and
Giannone ( 2019) approach by looking at different variables of medium-term vulnerabilities in the financial system. The authors include credit growth information,
house price growth, current account imbalances, etc. Another novelty is that they
constructed a measure of banking sector leverage to see how the increase in capital
requirements affects bank capital and growth-at-risk. As capital requirements were the main tool to build up the resilience of financial systems after the GFC, using an
indicator that captures this could be observed as an indicator of macroprudential
policy, whose effectiveness could be evaluated within the GaR setting. Here, the
main results indicate that greater capital requirements led to a 0.9 p.p. cumulative
improvement of GDP-at-risk over three years. This prompted the authors to make a
CCyB (countercyclical capital buffer) simulation as an example of capital requirements being increased before the GFC hit. Not surprisingly, the results showed that
such a requirement would offset the GDP-at-risk significantly.
2.3 Introducing the macroprudential policy indicator in the analysis
Macroprudential policy does not solely utilize capital requirements, but many other
instruments as well. Thus, MP variable as a full set of measures and instruments has
been introduced in the analysis, and, in some cases, the variable is divided among
several categories, such as tools that are mostly borrower-based ones, or capital
based, etc. (2014; 2011).
Several authors examined GaR model to evaluate the effectiveness of different tools.
Sánchez and Röhn (2016) examine not only MP, but also other policies and their
effects on future GDP growth via panel quantile regression for the case of OECD
countries. Main findings regarding MP effectiveness include lowering future mean
growth (costs), but also lowering potential losses (benefits, in the form of a decrease
in the amount of future GDP losses). However, since this policy is new compared
to others in the study, it is concluded that it should be explored more in the future.
Other policies, such as monetary, have longer datasets and so its effectiveness was
able to be evaluated in different phases of business cycles. MP on the other hand, for
some countries includes only the tightening phases after the GFC. Another study that
observes all MP tools is Duprey and Ueberfeldt (2018). This is a concise note about
GaR forecasting, in which both monetary and macroprudential policies are considered.
This work includes both theoretical considerations of tightening both policies and
empirical results for the Canadian case and period 1992 to 2020. Results show that
MP tightening is more effective for reducing downside risks of future growth than
monetary policy tightening. It means that in practice a tighter MP policy could be more
effective in strengthening the resilience of financial systems, as if a crisis happens in
the future, it will have fewer negative effects on real growth than monetary policy.
Two years later, the same authors ( 2020) published
a paper with more details on their previous work. Here, the main results show that
both policies reduce left tail risks by not affecting the median growth. This means
that in the medium-term neither policy has significant negative effects on the real
economy. Furthermore, if both policies are tighter, this can reduce the future tail
risk by targeting credit growth, and if the monetary policy is loose, the impact of
low interest rates on financial stability could be partially compensated with tighter
MP. All of this implies that MP really was effective in the Canadian case. Finally,
there is an interesting simulation made at the end of this study, where the authors
show how much benefit would have been obtained if a tighter MP had been in place
before 2018, leading to a reduction of central risk.
2.4 Recent findings on macroprudential policy effectiveness
As more data on MP indicator has become available, a richer analysis has been possible, as in Galán and Rodríguez-Moreno (2020), Galán (2020a, 2020b). Here, the
authors observe the MP effects at different phases of the financial cycle. Interaction
terms between the MP indicator and other variables were included in the analysis
to account for different phases of the financial cycle and financial stress levels in
economies. Studies looked at EU countries in the period 1970 to 2019 and applied the
panel quantile regression approach. The MP indicator was observed on an aggregated
level (i.e. including all MP tools and instruments), but also from the borrower-based
versus capital-based perspective. Some of the main findings here include that MP in
general in the medium-term does not have significant negative effects on the mean
growth, but has positive effects on the tail risks by reducing it up to 1.5 p.p.
Other studies that could observe richer results are those of Brandao-Marques et al.
( 2020), in which the authors utilize the quantile regression approach to propose a
cost-benefit approach to macroprudential policy. In a panel setting (period: 1990-
2016), they evaluate the effects of different types of policies on future GDP growth
and inflation. The authors found evidence of MP trade-offs regarding lowering mean
future growth and increasing the GaR growth (i.e. reducing the future losses). In
particular, benefits were the results of BBM (borrower-based measures), whereas
CBM (capital-based measures) were found to be better for building the system’s
resilience. Cucic et al. ( 2022) is an empirical case study of Denmark’s GaR in the
period 1982-2022. Both GaR and HaR (House price-at-Risk) were examined, and
the effectiveness of the BBM and CBM measures was compared. The authors
conclude that BBM measures shift the entire growth distribution right, whereas
CBM measures have a trade-off between GaR and median growth.
Franta and Gambacorta ( 2020) goes into more details regarding BBM measures, as
the authors apply the GaR approach to a panel dataset of 56 countries in the period
1980 to 2012 to evaluate the LTV (loan to value) and loan loss provisioning effects.
The results show that LTV narrows the whole future distribution of the growth,
whereas loan loss provisions only move the left tail of the distribution upward.
Thus, LTV can be used to reduce the volatility of GDP growth, whereas loan loss
provisioning decreases the GDP losses in the event of a crisis. Finally, as a last
recent empirical work related to this research, we found Drenkovska and Volčjak
( 2022). It is a study of the Slovenian GaR case in the period 2003-2020. This paper is
actually divided into two sections. In the first part, authors develop a financial stress
indicator for the Slovenian case. Then, the second part uses this indicator alongside
financial cycle and MP indicators to evaluate the MP stance. However, the authors
did not find the MP indicator to be significant in the analysis. An explanation could
be found in the utilisation of a single-country approach, with insufficient data being
provided for the tail risk estimation part of the framework itself.
3 Challenges with the macroprudential policy index
Before moving on to the empirical part of the study, we wanted to comment on some of
the challenges of using the MP variable in GaR analysis. To evaluate the MP stance, we
need to include the MPI (macroprudential policy indicator) in the model. MPI is built
upon information about (de)activating MP tools over time, and detailed information
about them can be found in several popular databases: ECB (2018) or IMF (2020b).
To construct the MP indicator, one has to have in mind that MP cannot be measured
as monetary policy through policy rate. Rather, it is measured through counting the
number of measures over time, by constructing indices based on a binary variable,
or a variable that takes a couple of values (e.g. -1, 0, or 1). This alone introduces the
challenge of aggregation of heterogeneous measures, and on top of that, the intensity
of different measures imposes an additional problem. First introduction of a measure, which is classified as a capital one, could have completely different effects to a
borrower-based measure. Moreover, introduction of a measure for the first time has
different effects compared to it being fine-tuned over time.
3.1 Definition and transformation of the MPI variable
First challenge is the definition of the MPI variable itself. One part of the research
that uses the MP variable takes the MPI index (regardless of the form and transformation) and calls this the macroprudential policy stance. Examples include Akinci
and Olmstead-Rumsey ( 2015): “... These cumulative variables sum the dummy
variables (tightening net of easing) to get an idea of a country’s ʻmacroprudential
policy stanceʼ in a given quarter...”; and Ćehajić and Košak, ( 2021): “we design our
main macroprudential measures by summing all policy changes over time, both
tightening and easing. This allows us to capture the overall macroprudential stance
in a given country and time period.” Although this is not wrong, such an approach
is not in line with the definitions of macroprudential stance as used in the GaR
literature. However, it introduces more complexity in comparison to results across
studies. Another issue is that some papers do not explicitly describe in which form
the MPI indicator enters the analysis (net values, cumulative, etc.).
When collecting data from established databases, one needs to assign numerical
outcomes. This is because all measures in such databases are given in a descriptive form, whereas MPI is defined as a simple binary variable. Positive unit value
indicates a tightening measure that took place in a given quarter and negative unit
value indicates a loosening one. Finally, a zero value is assigned to ambiguous and/
or absent measures (see formula 1). Descriptions on how the researcher can assign
these values to different tools can be found in Cerutti, Claessens and Laeven ( 2017),
Budnik and Kleibl ( 2018), Garcia Revelo, Lucotte and Pradines-Jobet ( 2020), etc.
In a given quarter, we can define a measure :
and by adding up the values in (1) over time, we obtain the cumulative value as
follows i:
(1)
and by adding up the values in (1) over time, we obtain the cumulative value as follows:
(2)
Usually, values in (1) are counted for a group or all MP tools. Thus, formula (2)
can present the cumulative value of all MP actions. This is a starting point in a lot
of research, reflecting a general policy direction. Based on Garcia Revelo, Lucotte
and Pradines-Jobet ( 2020), several other variants of MPI can be defined as follows.
The first variant represents quarterly MPI with three values: -1, 0, and 1, based on
tightening, loosening, or absence of all measures:
(3)
This means that regardless of the overall sum in each quarter being +1 or more,
it will be rescaled to +1, and something similar is true for negative values. Thus,
this transformation looks only at the information if the macroprudential policy is
tightening or loosening, regardless of the number of measures. A second measure
is to divide the original mpii,t by the number of measures in each quarter. This is
suitable for cross-country analyses. Several other specifications on a single-country
analysis are found in Ćehajić and Košak ( 2021) as follows:
and
and they take into consideration only the tightening or loosening of the policy. A
potential problem with these last two measures is found if there is not much data
on one type of policy, usually loosening.
As many countries have a lot of zero values in the above MPI specifications, some
authors ( 2015) try to overcome this by using a
cumulative MPI index as defined in (2). However, Plagborg-Møller et al. ( 2020)
and McCracken and Ng ( 2016) comment that it is better to utilize stationary variables if possible. MPI defined in (2) is often not stationary, especially in MP active
countries. That is why more research is looking at year-on-year changes in the
cumulative index:
(6)
as found in Galán ( 2020a, 2020b), Vandenbussche, Vogel and Detragiache ( 2015),
Cerutti, Claessens and Laeven ( 2017), Alam et al. ( 2019). Finally, the ESRB Report
( 2021) utilized a 20-quarter change of the cumulative MPI. This could be especially
problematic, as quantile regressions as methodological apparatus for GaR modelling
are estimated for growth up to 16 quarters ahead. This makes it difficult to interpret
measures that were put into force 20 quarters ago, and their effects 16 quarters in
the future (i.e., 9 years in total).
3.2 Intensity issues
Another important challenge when using the MPI variable as defined in the previous sub-section is that the values of positive unit, zero or negative unit only
reflect whether a measure is tightening or loosening. These values do not reflect
the intensity of a measure and its relative importance, e.g., the introduction of a
measure could have more significant effects on financial stability than fine-tuning
events. As an example, we focus on capital buffer requirements. Introduction of
these requirements had different effects on the banking systems, compared to fine
tuning, i.e. their subsequent additional increases. Values were adjusted over time9 .
This means that in the majority of cases, the MP indicator does not reflect the
magnitude of a measure, only the frequency of it.
A couple of papers emerged in the last couple of years that try to adjust the intensity of MPIs. Eller et al. ( 2020), Vandenbussche, Vogel and Detragiache ( 2015),
and Richter et al. ( 2018, 2019) have been working on this. Fernandez-Gallardo
and Paya ( 2020) follow Meuleman and Vander Vennet ( 2020), and in the first step
assign a positive value for tightening actions, the opposite for loosening, and zero
for ambiguous impact or no measures. For the intensity adjusting part, policy actions that are activated for the first time receive the highest weights, a lower value
for changes in the level, even lower for changes in the scope, and maintenance of
both level and scope is given the lowest weight. When a measure is deactivated,
the cumulative index gets value zero. Galán ( 2020b) besides the usual analysis (see
the literature review section), includes one section of robustness checking, in which
the author looks at the intensity of the LTV ratio and its effect on GaR. Since the
iMaPP (Integrated Macroprudential Policy) database that author uses in the study
includes mean regulatory LTV ratios, the author opted to test its effectiveness during the upswing and downturn of the financial cycle, and obtained results that are
consistent to the main ones in the first part of the study: in the expansion phase of
the cycle, tightening of LTV limits would improve GaR by approximately 0.5 p.p.
Negative effects on the median growth are also significant but negative.
Unfortunately, a consensus on how to solve this important challenge has not yet been
found because research states that “we assign a higher weight to policy actions we
consider to be more important”, as in Meuleman and Vander Vennet ( 2020). This
is something future research needs to work on, trying to find an objective way to
define such adjustments, and some solutions are summarized in Škrinjarić ( 2024).
3.3 Endogeneity issues
When policymakers and regulators make decisions about their tools and instruments,
they take into consideration some typical variables such as credit growth or debt burden.
Countries that experienced rapid credit growth (pre-GFC) have higher probability of
having tighter MP (2018). The endogeneity characteristic of macroprudential variable is probably the biggest challenge in research that tries
to evaluate MP effectiveness, regardless of the underlying methodological approach.
As the MP policymaker reacts to the expected economic environment, MP cannot be
used in the form described in the previous subsections to identify exogenous changes
(2018). However, the endogenous nature of MP is not new,
and there have been different approaches to tackle this concern regarding monetary and
fiscal policy. The main motivation is always the same: to identify the non-systematic
monetary policy movements so one can estimate causal effects of policy on macroeconomic variables. Some earlier approaches to solution of the endogeneity issue are
reviewed in Christiano, Eichenbaum and Evans (1999). Ramey (2016) on the other hand
reviewed some newer approaches, such as narrative identification, regime switching
approach, and many others, both for monetary and fiscal policy specifications. Prasad
et al. (2019 ), one of the earlier GaR studies, comments that GaR is not a structural
model, and cannot be used to talk about causality. Richter et al. (2018, 2019) define the
following criteria in order to talk about causality: policy actions need to be uncorrelated
with other possible shocks in the model, these policy shocks need to be unexpected,
and they also need to be exogenous in reference to the current and lagged variables.
Thus, there are a couple of ways to deal with this, explained below.
3.3.1 Obtaining non-systematic policy shocks
If the aim of the analysis is to discuss causality, then non-systematic policy shocks
should be used. They can be defined as a random portion of the policy not related to
the state of the economy (1999). Ever since the Lucas (1972) critique of
monetary policy, in which the non-systematic component is the only component to
be used when policy effects are evaluated, this part of the monetary policy has been
evaluated in empirical research. To obtain non-systematic policy shocks, the procedure
can be done in two steps. The first step observes the MPI as the dependent variable, and
it is regressed on a set of specific variables that are important in MP decision making.
Some examples include credit to GDP gap, house price dynamics, and other variables found in early warning literature (2018, 2022a), for an exhaustive list). Residual values from the estimated model
are collected and are observed as those policy actions that are not explained with the
variables that were used in the model, and should be non-systematic shocks. In the
second step, these residuals are used within the GaR model to talk about causality.
Some examples of using this within MP stance assessment are the following. Brandao-Marques et al. ( 2020) utilized ordered probit regression to obtain the non-systematic
MPI shock 10. Previous quarter credit-to-GDP gap, house price gap and previous year
cumulative value of MPI itself are used as explanatory variables in the regression.
There was a similar approach in Gelos et al. ( 2022). Galán ( 2020a) utilizes regression
to extract residuals from a model that includes all other regressors that enter the GaR
equation. Here, however, all of the variables are assumed to affect MPI in the same
quarter. This could be questionable, due to knowledge that in practice, data collection and decision making takes some time. Lagged values of explanatory variables
should be considered in explaining macroprudential decisions today. However, the
results in this study showed little difference in the results when the macroprudential
policy variable was purged from specific effects from macro-financial variables to the
results without any “cleaning” of the data. Reasoning could be as already mentioned
challenge of regressing the MPI on variables from the same quarter. Duprey and
Ueberfeldt ( 2020) also have an interesting approach, due to the MPI variable taking
values -1, 0 and 1. The authors opted to use propensity score matching, such that the
probability of MPI variable taking positive or negative values depends on the lags
of other variables that are considered in the GaR part of the analysis.
Two important things to consider in this two-step approach are the variable selection
to regress the MPI on and the lags of these variables. The model in the first step
should be correctly defined, i.e. the chosen variables should reflect what the MP
policy maker is actually considering when making decisions. Also, as MP reacts
to macro-financial environment with a lag, this should be taken into consideration
when doing this part of the analysis.
3.3.2 Considering dates of announcements and enforcements of measures
Some authors have a narrative approach for identifying macroprudential shocks,
such as De Schryder and Opitz ( 2019, 2021). This approach asks from the researcher
to read all of the policy tool announcements in order to distinguish those that are a
true shock compared to those that are reactions to the financial environment. The
focus is made on announcement and implementation dates. Some measures were
introduced and implemented in the same quarter, and those that did not have the
same quarter for introduction and implementation were excluded in MPI construction. The authors argue that banks can prepare themselves more if the announcement
date is far away from the implementation date, which is not in line with the definition
of unexpected shocks. These authors give an example of introduction of the LTV
(loan to value) ratio as to why they observe announcement and implementation
dates in the same quarter or not: banks could expand their lending when anticipating future credit restrictions, and the enforcement dates of a measure goes against
unexpected nature of shock. Something similar is done in Duprey and Ueberfeldt
(2020). Here, the authors estimate the model with MPI values that are based both
on announcement and dates when measures were put in force.
This approach is challenging in practice, as policymakers make decisions on some
MP tools by analysing the risks that are accumulating over some time. Sometimes,
before a new tightening measure is introduced, the policymaker could issue warnings or recommendations for certain behaviour. Financial stability reports often
have special sections/boxes that analyse certain challenges to the financial stability
of a system. This could prepare banks to change their behaviour over time, and
when a formal measure is announced, it could have the same effect as for the case
of observing the measure from the formal date it is put in force. Thus, future work
should try to gauge if some change in bank behaviour has preceded even the formal
announcement dates of a macroprudential measure.
3.3.3 Lagging values in models
Another approach is including the lagged values of some variables in the underlying
GaR regression. Some authors lag the explanatory variables in the GaR regression,
whereas others lag the dependent one (i.e. the MPI variable). Lagging the macrofinancial variables that are used in the GaR regression is based on the explanation
that the macroprudential policymaker makes decisions about tools with respect
to tracking those variables. It takes some time to evaluate the dynamics of those
variables. Thus, these variables are lagged in the GaR model specification, as if we
assume that MPI is affected by previous values of, e.g. financial vulnerabilities in
the system, it is an obvious choice to include previous lags of the latter variable in
a model. Cerutti, Claessens and Laeven (2017) state that a greater number of lags
of these variables should be included in the model. The question remains what a
greater number is, and if we do not have long time series (usually a problem for
MP empirical analyses), we cannot “afford” to include a great number of lags in
the model itself. The second approach of lagging the dependent variable is found
in Ossandon Busch et al. (2022), who only state that “causality concerns can be
addressed, for instance, by lagging the variable policy (referring to MPI) in order to
separate the policy decisions from current macro trends.” A similar approach is used
in Gelos et al. (2022), who add one year of lagged MPI data in the model, without
explaining the reasoning. The only thing that comes to mind is the following. In
modelling, in order to include effects of variables that are not explicitly included
in the model (due to, e.g. data unavailability), one can include a lagged value of
the dependent variable, as it includes in itself the effects of all factors, although
data cannot be collected on some of them or else they are not directly measurable.
Furthermore, there are also some papers that lag both the MPI indicator and the rest of
the macro-financials that are used in the GaR setting, such as Eller et al. ( 2020). Authors
decide on the lag selection based on the BIC (Bayes information criterion). This is a
purely statistical approach to the definition of the best model and should be complemented with MP knowledge from practice. It is still not completely clear which of these
approaches are correct, as sometimes they do the opposite things (lagging MPI versus
lagging variables that affect MPI), which leads to different economic interpretations,
alongside having econometric consequences. As endogeneity has been examined for
monetary and fiscal policy for some time now, future work that focuses on macroprudential policy should try to compare these approaches to see what should done next.
3.4 Different sources of MPI data issues
Different databases have been developed in the last couple of years, in which a systematic overview of the type of the measure was put into place (or revoked), with a description of the measure and a general explanation of why the measure was used. The ECB (2018) and IMF (2022a) are commonly used11. The ECB database, called MaPPED (Macroprudential Policies Evaluation Database), is a comprehensive dataset, with 1925 hundred policy actions for EU countries since 1995 until 201712. Supervisory authorities have submitted measures, their descriptions and other information on measures, and since macroprudential policy was somewhat formalized after the GFC, other measures before it have been retroactively categorized to fit macroprudential measures, or microprudential measures that had a macroprudential character. It also includes changes in measures, i.e. if fine tuning was done, so it presents a good starting point for an analysis.
The IMF database, iMaPP (Integrated Macroprudential Policy), combines information from various sources, including the Macroprudential Policy Survey, and the IMF member countries that submit information on a yearly basis. This database also has a detailed description of each submitted measure, alongside detailed classification, but some caveats are that not every measure is included (those that were introduced before the sample period started), and only those measures that were cross checked with official documents were included. However, the tools described in the IMF database are very different to those in the ECB version, as when we found something peculiar when doing research on this topic. The two mentioned databases have, differences, at least for the case of Croatia. All of the measures were compared, revised, and based on internal reports of the Croatian National Bank, the dates and data were adjusted to reflect the most accurate dynamics of MPI measures.
To depict the differences, a cumulative index was calculated based on formula (6) for the ECB, IMF and a combined revised version, and are shown in graph 1. The ECB database is not updated anymore, and that is why this index stopped in 2018. However, it is striking to see the differences between the two databases. The explanation is to be found in the different classifications of some measures; the IMF does not take into consideration some measures that could be broadly classified as “other” for the Croatian case, but which had macroprudential character, whereas the ECB did. The main differences, then, for the case of Croatia inhere in the ECB having a broader base of different tools that have not been strictly classified as macroprudential measures, but as having macroprudential purpose. On the other hand, the IMF did not include these measures, as we have seen when sifting through both datasets and reconciling them to obtain one final “clean” MPI dataset.
Graph 1Cumulative MPI values for Croatia, different sources DISPLAY Graph
Up until the writing of this research, no comments were found in related literature
on this problem. Authors usually collect the MPI data without manipulating it
additionally. However, one needs to bear it in mind if different sources are used,
the estimation of final results can be very different, especially for active countries
such as the example shown in graph 1. One future research direction would be to
tackle this issue
4 Methodology and data description
This section describes the methodology used in this paper in order to estimate
GaR for the Croatian case. Quantile regression and related topics are described.
After that, we describe the data used in this study for the empirical work done in
the next section.
4.1 Quantile regression13
A linear quantile regression (QR) model can be defined as:
(7)
where
is the dependent variable,
is the quantile, betas are parameters that need to be estimated at each quantile,
are conditional variables,
is the error term. To estimate model (1), for every quantile
,
, a minimization problem is solved:
(8)
where
is the estimated value of
. For the case of evaluating MP effects on future real growth
, the real growth is defined
quarters ahead:
(9)
where usually h = 1, ... , 16. A basic specification of a QR model that describes yt+h
could be the following:
(10)
where MPI is the macroprudential policy indicator, Stress denotes indicator of
financial stress, and FV is a financial vulnerabilities variable. Mentioned variables
are an example of which variables are usually used in this modelling. In other
words, the GaR model in (10) usually includes the autoregressive term y, the MPI
indicator in some form as commented on in section 3.1., and then a variable that
corresponds to financial conditions, stress or systemic risk indicators, with a final
variable of financial vulnerabilities or financial cycle indicator. This work will look
into financial stress and several financial cycle indicators in the empirical section.
To evaluate the values of coefficients at different forecast horizons h, the dependent
variable on the left-hand side of equation (10) is changed, such that the h quarter
growth from equation (9) is regressed on the same set of variables in equation (10).
This is the local projection approach, as often used in macroeconomic literature
and the plotted reaction of GDP growth to changes in explanatory variables is
considered as the impulse response ( 2023).
Goodness of fit of a QR model can be measured with pseudo-R squared, evaluated
at each quantile θ:
(11)
where RASWθ
is the residual absolute sum of weighted deviations of real values
to the estimated ones, and TASWθ
is the total absolute sum of weighted deviations.
Rationales on why the MP effectiveness changes across the growth distribution and
alongside different coefficients are in place both for financial conditions/stress and
financial cycle indicators is as follows. The early warning methodology literature
( 2018) on which variables forecast financial
crises has shown that financial cycle indicators have good predictive power of not
only financial crises, but also subsequent economic downturns. This means that the OLS estimates cannot capture those tail risks. If one used the threshold regression
approach, the usual assumptions that hold for OLS should also hold here, which
would not capture the heteroskedasticity in the data that is present, alongside other
assumptions regarding the error term. Moreover, by applying threshold regression,
one would need to sub select the dataset into more regions for which the model
is estimated above and below a certain threshold, which would result in an insufficient number of datapoints for the tail risk. Moreover, one would also need to
test for more than one threshold, which is not feasible for such a short time series.
Furthermore, if one opted for time varying parameters, same assumptions on the
error term need to be imposed as for OLS, which is again not satisfied in practice.
Quantile regression does not rely on any assumption on the distribution of the
datasets that are used, or about the error term. Next, the seminal contribution of
Adrian, Boyarchenko and Giannone ( 2019) has shown that there is almost no effect
on mean growth when the usual set of variables that are used is complemented with
a financial stress indicator. On the opposite side, there is a significant negative effect
on the downside growth risk. This was empirically tested on other economies in
the following research, thus it made a stepping stone by which to move from linear
models to the quantile regression approach. From the economic point of view, the
reason on why the MPI would have different effects on GDP growth at different
parts of the distribution is that if done properly, increases of MPI value (which
means that the policy is tightening) in good times should increase the resilience
of the financial system, which would prepare it to deal with a future crisis better
by avoiding huge losses. However, increasing the resilience does come at a cost,
by, e.g. banks having greater capital requirements would perhaps decide to reduce
lending in some capacity, which would decrease the investment in the economy
and thus, the mean growth would be reduced as a consequence.
4.2 Fitting the conditional distribution of estimated growth
The usual procedure after the QR estimation is to fit the skewed t-distribution of
Azzalini and Capitanio (2003):
(12)
where
and
are the probability density function and cumulative density function respectively,
is the location parameter,
is scale,
fatness, and
the shape parameter. Function (13) is used to smooth out the quantile function. In that way, the probability density function is obtained:
(13)
by matching the quantiles of the skewed t-distribution to the empirical quantiles
obtained from the estimation. The empirical quantiles are usually the 5 th, 25 th, 75 th
and 95 th. Some exceptions can be made to the 10 th and 90 th, when dealing with
fewer data. Although the QR model obtains more estimated percentiles, Adrian,
Boyarchenko and Giannone ( 2019) opt to have fewer quantiles for (13) to avoid
over-parametrization. Another approach is found in Lloyd, Manuel and Panchev
( 2022) and Mitchell, Poon and Zhu ( 2021), where a non-parametric approach is
used: conditional quantiles are mapped to conditional density, and interpolations
across adjacent quantiles are made to smooth out the density. These papers use a
measure of model accuracy, the unconditional coverage (UC) test of Kupiec ( 1995),
usually called a back-testing technique, to evaluate the quality of the model. The UC
test null hypothesis assumes that, on average, the conditional quantile is a correct
coverage of the selected percentile of the forecasted distribution.
4.3 Distance to tail concept
Once the full model is estimated, one could calculate a measure called distance to
tail (DTT), as a measure of downside risks, captured by the difference between the
median and GaR value (2021). Thus, the policymaker could observe additional information from DTT in the following way. When evaluating the results of
MPI effects on the median and GaR growth, the difference between two can also be
looked at, as the value should decrease if the MP does not have negative effects on
the mean growth, and positive effects on the lower tail risk at the same time. This
is due to the “pushing” of the left tail of future GDP growth distribution towards
the mean outcome. The economic rationale behind this is that if the policymaker
imposes tighter restrictions on the financial system in “good” times, i.e. when the
economy is in the upward phase of the business cycle, it should not be burdensome
to financial institutions to increase their resilience. Afterwards, if a crisis or another
negative shock happens that will affect the real economy in the future, the increased
resilience today would prevent an even greater crisis at the end, i.e. the GaR value
should be in better shape than if we did not impose tightening before the shock.
Thus, a tighter stance is characterized with a lower DTT compared to a reference
distance. The question remains of what reference value is to be compared to the
empirical DTT values we obtain in the analyses. No consensus exists today; thus,
in the empirical part we compare the empirical DTT values to the average in the
historical sample (2022).
4.4 Data description and stylized facts
For the empirical analysis, quarterly data on real 14 GDP for Croatia was collected from
CNB 2023) for Q1 1991 to Q2 2022. Graph 2 depicts the dynamics of year-on-year
growth in the entire period, where the consequences of the Croatian War of Independence at the beginning of the sample are visible, the banking crisis of 1998, the GFC,
and the COVID-19 crisis are seen. The unconditional distribution of real growth is
depicted in graph 3 (left panel), and it is evident that it is not a normal distribution,
with a more significant left-sided skewness, which is corroborated in the right panel of graph 3. Quantiles of Normal distribution are contrasted to the empirical quantiles
of real growth, and a significant departure is apparent. This is in line with related
literature (2015; 2016).
The second important variable in the analysis is the macroprudential policy index.
The MPI observed in this study is based on the combination of the ECB and IMF
databases, with incorporated corrections. The starting date for this variable is Q1
1994. Croatia has a relatively active macroprudential policy, so during the 2000s,
due to the enormous credit growth (due to financial deepening and general increase
before the GFC hit), among other factors, tightening measures were made taken
often than loosening ones. Graph 4 depicts the number of tightening and loosening
measures (panel a), whereas their signs are taken into consideration in panel b.
Graph 2Real GDP growth, year-on-year, in % DISPLAY Graph Graph 3Histogram, kernel density and QQ plot for year-on-year real GDP growth rate DISPLAY Graph Graph 4Macroprudential policy index dynamics DISPLAY Graph
Another relevant variable in the GaR approach is financial vulnerability. This
variable is also problematic as well, as different authors utilize a wide range of
variables that capture credit dynamics, house price dynamics, credit institution
vulnerabilities, etc. ESRB ( 2021) uses d-SRI (domestic systemic risk indicator) as
it is based on panel estimation and is more comparable across countries. Individual
studies focusing on a single-country analysis often substitute this indicator for one
better suited for that country. This study will do the same. Besides the usual 15 credit
dynamics variables and d-SRI, this study observes ICSR (Indicator of Cyclical
Systemic Risks) as a Croatian version 16 of the composite indicator.
Table 1 gives a brief overview of financial vulnerability measures tested in this
study, with graph 5 showing their dynamics ( 2022; 2022b, 2023c). Dynamics in graph 5 shows that the credit growth was substantial in the
2000s due to financial deepening. Value of composite indicators of cyclical systemic
risks increased during the 2000s, reflecting not only the rising credit dynamics but
other relevant categories of financial vulnerabilities, such as house price dynamics, external imbalances, private sector debt burden, mispricing of risk, etc. ( 2023a). Indicators reached their maximal values in 2007 and dropped
fast when the crisis hit. The prolonged recession lasted for a few years, and in 2017
a mild recovery started. Finally, something to keep in mind is the problem of the
non-stationarity of the data. White, Kim and Manganelli ( 2015a, 2015b) assume
that data for this analysis are stationary. The best option would be to have all variables transformed in such a way that they are stationary, as the predictability of time
series is mostly based on the stationarity of the series itself. The d-SRI indicator
is the variable commonly used, but it does not satisfy this assumption. All of the
specifications in table 1 and graph 5 will be tested in section 5.2.1. to find which
variable definition is the best in terms of model performance.
Table 1Financial vulnerabilities variables DISPLAY Table
The financial stress indicator for the Croatian case is somewhat problematic, as
the ECB ( 2023) version has a very different dynamic compared to the one that
the CNB developed (the period for this variable is Q1 1990 to 2Q 2022). Graph 6
contrasts the two indicators, where it is seen that during the GFC and the sovereign
bond crises, the ECB version does not capture the stress, whereas the COVID-19
crisis and war in Ukraine are not much reflected in the CNB version. CLIFS is
constructed based on three markets: equity, bond and foreign exchange market
(see Duprey et al., 2015), whereas HIFS is the tweaked version of CISS ( 2012), in which some minor things are changed based on
data unavailability, and includes all five markets (besides the aforementioned ones
in HIFS, money and bank markets).
Graph 5Financial vulnerabilities in Croatia, different measures DISPLAY Graph
Graph 6Comparison of CLIFS (ECB version) to the HIFS (CNB version) of financial stress DISPLAY Graph
5 Empirical application: Croatian case
This section provides the main empirical analysis of the paper. We firstly comment
on reducing the endogeneity of the policy variable itself. Afterwards, we compare
the goodness of fit with respect to different variables to measure financial cycle or vulnerability. When the best models are selected, we compare their results regarding
the MPI effectiveness for the tail risk and median growth. Finally, we show how
the distribution of GDP growth changes over time, and comment on the resulting
distance to tail measure.
5.1 Trying to reduce endogeneity of macroprudential policy index
Following the references in section 3.3.1., we obtain non-systematic shocks of noncumulative MPI values (i.e. just counting the number of tightening or loosening
measures) via ordered logistic regression, as the order of the MPI values matters.
MPI was calculated based on formula (1) in each quarter, i.e. where the tightening
measures were given the value +1 for each measure, loosening measures were given
the value -1 per measure, and absence of any measure or ambiguous ones were
given the value 0. Then, the net MPI is calculated by reducing the total amount
of loosening from the total amount of tightening measures. was calculated
according to formula (3).
As previously remarked, the macroprudential policy cannot immediately react to
macro-financial surroundings due to data lags, legislation bounds, etc. That is why
we compare several model specifications to obtain the non-systematic policy shock
in the first step, in which lagged values of real growth, financial stress (HIFS, the
HR version), and financial vulnerabilities (y-o-y change of credit-to-GDP ratio) are
used. We are interested in talking about causal effects, and since there exists a bulk
of literature on monetary and fiscal policy that takes this approach in extracting
policy shocks to talk about these effects, currently we opted to take this approach
( 2016).
Table 2 lists AIC values 17 for both MPI specifications, where models M1 to M4
refer to how many lags of other variables are included 18. Models with three lags of
other variables have the lowest AIC value, so they will be used to obtain residuals
of the macroprudential policy variable.
Table 2AIC values of several model specifications DISPLAY Table
5.2 Quantile regression results
Results onwards include the following variables and transformations: – Real GDP growth, forecasting horizons h = 4 and 12 to contrast short- and
medium-term results in models. – Residuals from models (M3) in table 2 for MPI and . – All nine financial vulnerabilities indicators from graph 5. – Original values of MPI and for models where lagged variables are
included.
As many combinations of variables could be observed, to reduce their number,
individual (one explanatory variable at the time) quantile regressions are estimated
for the case of MPI and financial vulnerabilities. Finally, the best ones are selected
for further analysis as follows.
5.2.1 Selecting best variables for each indicator category
The selection criteria for the best models onwards are the following ones: we
compare the value of pseudo R-squares on each quantile, ranging from 10th until
95th, firstly between all possible candidates of financial vulnerabilities. Then, the
same is done for the financial stress variables (HIFS and CLIFS), and finally for
the MPI 1 versus 2 (after purging effects of other variables in them from the previous subsections). These comparisons are done for h = 4 and 12 quarters ahead,
to get an idea of the performance both in the short and medium run. Then, we try
to select variables that have an overall better performance over all quantiles over
both time horizons. For the comparisons, we estimate a quantile regression on an
individual variable basis.
Pseudo R-squares are shown in panels (a) and (b) in graph 7. It is visible that
selection of the best indicator is not straightforward, as some indicators are better
at certain quantiles, but worse at others. Also, at one horizon one variable is better
performing, but worse at another horizon. When comparing all the variables in
panels (a) and (b), the best ones are the non-stationary variables: ICSR, d-SRI, and
credit-to-GDP gap. They are followed by stationary ones: y-o-y and 2-year change
of credit-to-GDP ratio. We opt to use stationary variables over the non-stationary
ones, as the rest of the variables in the model exhibit stationary behaviour. Panels
(c) and (d) compare the MPI variables, and here the picture is a bit clearer: MPI
has better performance.
Graph 7Comparing pseudo-R squares of individual variables DISPLAY Graph
5.2.2 Selected models’ results
Based on previous discussions, the following variants of the model are compared: – Model (1): y-o-y change of credit-to-GDP ratio, HIFS, residuals of MPI
– Model (2): 2-year change of credit-to-GDP ratio, HIFS, residuals of MPI
– Model (3): ICSR, HIFS, residuals of MPI.
Graph 8Graph 8 Pseudo R-squares for models (1) to (3) DISPLAY Graph
Graph 8 shows pseudo-R squares for all three models, for h = 4 and 12 quarter ahead
growth forecast. There are small differences between M (1) and M (2), whereas M
(3) is the worst performing one, as the overall pseudo R-squared is the worst. When
looking at p-values of UC tests (see table 3), all three models perform well (the null
hypothesis cannot be rejected in all cases), i.e. the estimated 10th percentile and median correctly cover the 10th percentile and median of the true growth realizations.
Table 3UC test results (p-values) for all three models DISPLAY Table
When comparing the effects of MPI variables in models (1) to (3), graph 9 19 shows
the estimated coefficients for h = 4 for the QR case (dotted curve), which is contrasted to the OLS results (red dashed line). In all three cases, the MPI QR estimates
differ over quantiles and are different compared to the OLS lines. At first glance,
the effects on the lower tail of the growth distribution are positive and greater
than the median (central) value. This is in line with previous research showing
that tighter macroprudential policy positively affects the future lower tail of GDP
growth distribution ( 2020a, 2020b; 2020). However, positive, albeit almost nonsignificant, results regarding the effect
on the median could also be explained. When times are good, in terms of economic
growth and the upward phase of the financial cycle, imposing higher reasonable
macroprudential requirements cannot hurt future average growth, especially when
credit institutions have fairly high own voluntary buffers.
Graph 10 additionally examines confidence intervals for the MPI variable, across
different forecasting horizons. Although the interval estimates include zero values
in all cases, if the prudential authority thinks that the selected variables and model
are reasonable, adding new data in the future could change these findings in favour
of significant results. From the literature review so far, one would expect to have
positive significant results on the GaR value, with an either negative or an insignificant effect on the median growth. Some reasoning on why the results are not (yet)
significant could be a relatively short time series for a single-country analysis, and
the definition of the MPI variable itself, without intensity adjustment. Although
we have time series that start in mid-90s which is fairly good for macroprudential
policy, there are still not enough datapoints to cover the richer structure of the GDP
growth distribution. Moreover, the GDP drops observed for this country in particular have different origins, and the magnitude varied. So far, the worst realizations
refer to the Covid-19 shock and the GFC. The methodology applied in this type of
research is not meant to capture Covid shocks. Thus, effectively, the GFC is the
main driver of results regarding the tail risk. Moreover, the MPI in this paper is used
to reflect the number of measures, not their adjusting or fine-tuning. So far, there
is no consensus on how to adjust the MPI values in the best way, as it is dependent
on specific country and general macroprudential policymaker experience If this
were done, perhaps it could change the results obtained here.
Moreover, beta values for the median growth case are constant over all observed
horizons, around 1%, but not significant. This is in line with Suarez ( 2021), where
MP stance and effects on future growth are explained from a theoretical point of
view: if no effects on median growth are found, this could indicate that there are
still some non-linear MP effects on growth that are not captured in the GaR setting. Another explanation is that there exists a natural limit to some MP tools that
being applied in practice did not have negative effects on economic growth. As
the Croatian macroprudential policy is fairly active, the latter could be true. The
Croatian banking system has been one of the highest capitalized in the EU since the
capital requirements were introduced after the GFC. Thus, this affects the results
as well, due to the frequency of increases made over time, and this is in line with
Aikman et al. ( 2018) who found positive effects of higher bank capitalization on
GaR, with no significant reduction of median growth. Although not significant,
the beta coefficients for the 10 th percentile start with the highest value for h = 4,
and for each subsequent horizon decline. When compared to previous related literature (see literature review section), the signs of the estimated parameters are in
line with related studies. However, the insignificance of the results could be also
explained by the information that Croatia does not have borrower-based measures,
which were found to be more effective in this analysis in previous related papers
( 2022).
Graph 9Estimated coefficients for models (1) – (3), h = 4 quarters ahead DISPLAY Graph Graph 10Macroprudential policy effects on future growth DISPLAY Graph
5.2.3 Distribution fitting results
Next, skewed t-distributions for every quarter from the GaR model were fitted as
described in section 5.2. Graph 11 shows the distribution changes over time (right
panel is the left one but rotated so that older values can be seen better). The model
captures specific dynamics very well, as the distribution becomes heavily tilted to
the left just before and during the GFC; the prolonged recession afterward is also
visible, as the distributions were more left-tilted for a longer time. Finally, from
2015 onwards, the distributions became more compact until the COVID-19 shock
shook it up again.
Graph 11Fitted growth distributions from model (1), h = 4 DISPLAY Graph
5.2.4 Macroprudential stance measure (distance to tail)
Using estimates from models (1) to (3), distance to tails (DTTs) have been calculated as the difference between the median and the 10th percentile growth for h =
420. Results are shown in graph 12. All estimated DTTs are volatile, and it is hard to
tell a story from them. Panel (a) shows that before the GFC, most of the time, DTT
was below the median value and was tighter than in the period from 2015 to 2020.
Covid-19 shock distorted the results at the end of the period, but the downward
trend of DTT would likely have continued without this shock, as the rapid growth of consumer credit was in place before Covid hit. Moreover, this value is around
the median21 value, which could be a somewhat neutral level of macroprudential
stance. Panels (b) and (c) tell completely different stories: in the pre-GFC period,
the stance was looser due to higher DTT values, and in the second sub-period, the
stance is tighter, with an increase of DTTs at the end of the observed periods. This
cannot be true in practice. These results show how stance assessment is subject to
data selection, transformation, and other relevant issues that were commented on
in previous sections.
Graph 12Distance to tail from models (1) to (3) DISPLAY Graph
Moreover, suppose one selected, e.g. the panel (a) DTT to be the true one, i.e.
reflecting the actual effects of macroprudential policy on Croatian growth. In that
case, the remaining question is how to evaluate this observed DTT to the neutral or
optimal value? As the optimal DTT depends on the macroprudential policymaker’s
preferences, alongside the relative effectiveness of this policy on GaR compared
to median growth, it is evident that this is a difficult empirical task. Future work
will probably include the calibration of utility function parameters based on policymakers’ revealed preferences. Currently, we are left with observing the results with respect to the historical distribution of DTT in graph 12, panel (d). It takes the
DTT from panel (a) and adds a trend line (grey line). Cucic et al. (2022) similarly
observed DTT by looking at the median value. Red arrows show the general direction of DTT dynamics over time. Before the GFC, the policy was introducing more
measures as it was developing and trying to tackle the enormous credit growth. This
decreased DTT over time. During the GFC, policy introduced loosening measures,
which surely helped the DTT to decrease again after it spiked at the beginning of
the crisis. A Croatia-specific situation afterward, the prolonged recession, could
have affected the onward DTT, which was increasing until 2017. New tightening
measures reduced the DTT onwards.
6 Discussion and conclusion
Theoretical considerations about the effectiveness of macroprudential policy have
been developing in the last couple of years, with explanations how this policy
should work and affect future growth (2021; 2021). However, practice so far has produced mixed results. An
exhaustive literature overview in the first part of this paper sheds some light on the
reasons why the results are very mixed. They could be different variable definition,
selection, and transformation, and could also probably be due to the bird’s eye approach to estimation (macro picture is observed, thus it is tough to capture some
transmission mechanisms that way).
The inconclusive results of this study are in line with the comments of Reichlin,
Ricco and Hasenzagl ( 2020), who agree that the relationship between financial and
real variables is difficult to model. This is proven in this paper, where it is shown
that the results vary with respect to variable definition, and model specification.
One conclusion could be entirely different, if some of the changes are made. Such
findings indicate that more work needs to be done before fully operationalizing the
GaR approach to evaluate the MP stance on a regular basis. This is one of many
papers that find GaR modelling challenging. This means that so far potential usage
of this framework to tailor MP tools could be questionable. Alessandri and Di Cesare ( 2021) warn about the empirical problems and that MP instrument calibration
based on such an approach should be very cautious. From this, we conclude that so
far, MP tools should not be tailored according to the results obtained in this study.
The initial results obtained from this study need to be taken with some caution.
Results, although still insignificant, show that the effect of tighter macroprudential
policy is positive on the lower tail of the future GDP growth, without effects on
the median growth when focusing on a one-year-ahead forecast. This means that
the distribution is reshaped to lower the magnitude of downside risks. Tightening
in normal times does not disturb future average growth, but it could have greater
positive effects on reducing the downside risks when they materialize.
When comparing the approach and results to the ESRB ( 2021) report, one needs to
take into consideration a couple of things. Although it seems that the results in the
report are stable and more usable than what was obtained here, there are caveats and challenges found in the ESRB approach. In the mentioned report, the transformation of the MPI indicator is rather questionable. All MP tools are converted
into +1 or -1, with the final MPI variable calculated as a cumulative value of all
tools that were observed over time for a given country. Then, a 5-year change is
the basis for the transformation of the cumulative indicator. This 5-year change is
used as the main policy indicator in the GaR model where the forecasts are made
up until 4 years ahead. This would mean that the effects of macroprudential policy
could take place over a 9-year period, which is too long. Furthermore, a 5-year
change has a long memory and often is not stationary for countries like Croatia. The
second challenge is the failure to solve the endogeneity issue of the policy variable.
So, the results in the mentioned report are not comparable to those obtained here.
Some shortcomings of the approach taken in this research include the single equation approach. Future GDP growth is the only variable in this setting that is assumed
to be endogenous. However, the interaction between the financial system and the
real economy is two-sided. There has been some work on this that started emerging
in the recent period: the ECB has been working on the quantile vector autoregression
approach to deal with endogeneity of macro-financial variables and the feedback
loops between the real and financial sector ( 2020).
In such a framework, one does not need to have a two-step procedure of purging
the MP variable from macroeconomic shocks. Rather, the nature of vector autoregressive models can capture all interactions in one go.
Future work should mostly focus on resolving the MPI definition, i.e. how to
translate different tools and their intensity into the final MPI value 22; on solving
the endogeneity challenge of the policy itself in order to talk about causality and
measuring MP effectiveness. This could be done by trying to find a Taylor rule for
macroprudential policy as a first step of the analysis. Although this was tried in this
paper, one reason on why the results are still not satisfactory could be relatively
short time series. If this is not solved when more data becomes available, it should
be solved via the quantile VAR approach. Furthermore, as with other modelling,
the recent COVID-19 shock has distorted some of the time series that are used in
the empirical analysis. In this research, we did not do anything in this respect, i.e.
the series were used without any “cleaning” beforehand. As GaR framework is not
intended to capture such shocks, it is reasonable that the model used in this study
could not forecast such shock in the GDP series. However, having this period in
the dataset could affect the overall model results. Future work should try to see
how to tackle this challenge.
Some authors warn that the empirical research relies on quantile regressions too
heavily and found that GARCH (generalized autoregressive conditional heteroskedasticity) models outperform the QR one ( 2021). Thus, future work could consider other methodological directions, like the MIDAS-QR
(mixed data sampling), where higher frequency data could be used for forecasting
purposes ( 2022). Some authors are starting to focus
on the DSGE (dynamic stochastic general equilibrium) modelling approach ( 2018). However, others criticize this framework for not capturing tail risks ( 2016), so an opportunity may exist to extend DSGE to
GaR analysis. It is expected that the GaR framework will become more prevalent
in climate change analysis. Bayoumi, Quayyum and Das ( 2021) and Kiley ( 2021)
already provide an introduction. As climate disasters are becoming more frequent,
it would not be surprising to see more and more applications capable of visualising
the effects on financial stability.
Notes
* The author states that the views expressed in this paper do not represent the views of the Bank of England.
This paper was written at time the author was employed at Croatian National Bank. The author would like to thank two reviewers for their helpful comments and advice.
1 However, there is still no consensus on this, as found in Arslan and Upper (2017).
2 Besides the papers mentioned below, see, e.g. Škrinjarić (2023d, 2024).
3 Also, financial crises are costly. Reinhart and Rogoff (2009) estimate that crisis episodes are related to significant increases in government spending, as government debt increases on average by 86% for three years following a banking crisis. Laeven and Valencia (2012) estimated that the cumulative cost of banking crises is about 23% of GDP during the first four years of their duration, and fiscal costs amount to about 6.8% of GDP (Laeven and Valencia, 2013). Jordá, Schularick and Taylor (2013) found that financial crises are costlier than other recessions, as after five years, the real GDP per capita is lower by 5% compared to other “normal” recessions. Recoveries from financial crises are slower when compared to other types of crises, as found in Kannan, Scott and Terrones (2013). Other relevant findings about the costs of financial crises can be found in Koh et al. (2020), Jordá, Schularick and Taylor (2012), Claessens, Kose and Terrones (2012), and Papell and Prudan (2011). To avoid the costs caused by financial crises, systemic risk should be reduced, in which endeavour macroprudential policy plays an important role.
4 Other interesting and important variables have been analysed, such as inflation-at-risk (López-Salido and Loria, 2021), bank capital-at-risk (Lang and Forletta, 2019; 2020), house-price-at-risk (Deghi et al., 2020), unemployment (Adams et al., 2020), or capital flows (Eguren-Martin et al., 2021; Gelos et al., 2022).
5 E.g., Plagborg-Møller et al. (2020) found significant country heterogeneity in their results. After a battery of forecasts and estimations made, the authors found a couple of significant mean growth predictors, and fewer still for the volatility of growth, alongside different signs of results, and great cross-country heterogeneity in the results, which prompted the authors to conclude that some caution needs to be taken when one tries to build a theoretical model on empirical results.
6 As an example, a credit-to-GNI (Gross National Income) gap and y-o-y GNI growth rates are used for the case of Ireland instead of GDP (Gross Domestic Product), as GNI is a better representation for this case, as well as ICSI (Irish Composite Stress Index) instead of CLIFS (Country-Level Index of Financial Stress) in O’Brien and Wosser (2021).
7 Besides the works that are examined below, it is worth mentioning other preceding research that links financial conditions and financial vulnerabilities to the real economy. A comprehensive overview is given in Boyarchenko, Favara and Schularick (2022) and Škrinjarić (2022a; 2023a).
8 For the US case, and 1980 for other countries.
9 As explained in Škrinjarić (2024), another example of different effects could be that when comparing the countercyclical buffer (CCyB) actions, one country could immediately introduce a value of 2% to take place in a given banking system. This country would get +1 value in the quarter when this action is taken. If the country does not change CCyB in the next few quarters, the value remains at +1. On the other hand, if another country decides to introduce 0.5% CCyB value, and in each subsequent quarter increase it by 0.5 p.p., it will get positive unit value every quarter and could have a cumulative indicator greater than the first country.
10 As it takes values {-2, -1, 0, 1, 2}.
11 Others include the ESRB database for EU countries: [CrossRef], or Cerutti, Claessens and Laeven (2015). Some other sources are listed and commented in Alam et al. (2019), in appendix I, table 4.
12 This number comes from counting the total number of all tools in the Excel sheet provided in Budnik and Kleibl (2018).
13 Introduction to quantile regression, alongside advantages to other approaches, such as being robust to outliers, heteroskedasticity, non-normality, etc., can be found in Koenker (2005), Davino, Furno and Vistocco (2013), or Koenker and Bassett (1978).
14 GDP deflator was used to deflate the original nominal GDP series.
15 See Škrinjarić and Bukovšak (2022) for Croatia’s best individual credit dynamics indicators.
16 See Škrinjarić (2022a; 2023b) for the composite indicator for Croatia.
17 SIC values resulted in the same ordering. As these are just ordinary regressions, the idea is to see the tradeoff between the explanatory power of the model versus the number of parameters included in the model. Information criteria give us this information.
18 I.e., we compare four models M_i, where i stands for how many lags of all variables on the right-hand side
(RHS) of the ordered probit equation symbol were included. The explanatory variables included lagged value
of the real growth itself, as it is usually put in GaR modelling, and the other variables included were: HIFS
and YoY change of the credit-to-GDP ratio. E.g., M_3 means that all variables on the RHS were included with
lags 1, 2 and 3 to regress the MPI dynamics on.
19 Although we are mostly interested in comparing the median and the GaR value, i.e. calculating distance
to tail, we are showing all quantiles in graph 9 to get a better picture on the stability of the beta coefficients.
20 We use MPI “shocks” from a variable that was defined with values being equal to +1 or -1 (before purging out effects of other variables), and as we are not using moving sums as some studies do, there is no reason to believe that a measure that takes +1 value in, e.g. 1Q 2019 should have effects 12Q ahead, as this is
way overstretching the effects that macroprudential policy has. Using moving sums or similar transformations
would include a greater autocorrelation, i.e. memory of the variable and thus it would make sense to look at
a longer time horizon. But to observe effects 3 years in future is really overstretching and we don’t hear central banks saying that the macroprudential measures have significant effects on the GDP growth or in general
the real economy so long in the future.
21 Here, we depict the median value of DTT as just a statistical value. It does not replace the theoretical “optimal” DTT value.
22 Some initial steps have been done by Vandenbussche, Vogel and Detragiache (2015) and followed by Eller et al. (2020).
* The author states that the views expressed in this paper do not represent the views of the Bank of England.
This paper was written at time the author was employed at Croatian National Bank. The author would like to thank two reviewers for their helpful comments and advice.
1 However, there is still no consensus on this, as found in Arslan and Upper ( 2017).
2 Besides the papers mentioned below, see, e.g. Škrinjarić ( 2023d, 2024).
3 Also, financial crises are costly. Reinhart and Rogoff ( 2009) estimate that crisis episodes are related to significant increases in government spending, as government debt increases on average by 86% for three years following a banking crisis. Laeven and Valencia ( 2012) estimated that the cumulative cost of banking crises is about 23% of GDP during the first four years of their duration, and fiscal costs amount to about 6.8% of GDP (Laeven and Valencia, 2013). Jordá, Schularick and Taylor ( 2013) found that financial crises are costlier than other recessions, as after five years, the real GDP per capita is lower by 5% compared to other “normal” recessions. Recoveries from financial crises are slower when compared to other types of crises, as found in Kannan, Scott and Terrones ( 2013). Other relevant findings about the costs of financial crises can be found in Koh et al. ( 2020), Jordá, Schularick and Taylor ( 2012), Claessens, Kose and Terrones ( 2012), and Papell and Prudan ( 2011). To avoid the costs caused by financial crises, systemic risk should be reduced, in which endeavour macroprudential policy plays an important role.
4 Other interesting and important variables have been analysed, such as inflation-at-risk (López-Salido and Loria, 2021), bank capital-at-risk (Lang and Forletta, 2019; 2020), house-price-at-risk (Deghi et al., 2020), unemployment (Adams et al., 2020), or capital flows (Eguren-Martin et al., 2021; Gelos et al., 2022).
5 E.g., Plagborg-Møller et al. ( 2020) found significant country heterogeneity in their results. After a battery of forecasts and estimations made, the authors found a couple of significant mean growth predictors, and fewer still for the volatility of growth, alongside different signs of results, and great cross-country heterogeneity in the results, which prompted the authors to conclude that some caution needs to be taken when one tries to build a theoretical model on empirical results.
6 As an example, a credit-to-GNI (Gross National Income) gap and y-o-y GNI growth rates are used for the case of Ireland instead of GDP (Gross Domestic Product), as GNI is a better representation for this case, as well as ICSI (Irish Composite Stress Index) instead of CLIFS (Country-Level Index of Financial Stress) in O’Brien and Wosser ( 2021).
7 Besides the works that are examined below, it is worth mentioning other preceding research that links financial conditions and financial vulnerabilities to the real economy. A comprehensive overview is given in Boyarchenko, Favara and Schularick ( 2022) and Škrinjarić ( 2022a; 2023a).
8 For the US case, and 1980 for other countries.
9 As explained in Škrinjarić ( 2024), another example of different effects could be that when comparing the countercyclical buffer (CCyB) actions, one country could immediately introduce a value of 2% to take place in a given banking system. This country would get +1 value in the quarter when this action is taken. If the country does not change CCyB in the next few quarters, the value remains at +1. On the other hand, if another country decides to introduce 0.5% CCyB value, and in each subsequent quarter increase it by 0.5 p.p., it will get positive unit value every quarter and could have a cumulative indicator greater than the first country.
10 As it takes values {-2, -1, 0, 1, 2}.
11 Others include the ESRB database for EU countries: [ CrossRef], or Cerutti, Claessens and Laeven ( 2015). Some other sources are listed and commented in Alam et al. ( 2019), in appendix I, table 4.
12 This number comes from counting the total number of all tools in the Excel sheet provided in Budnik and Kleibl ( 2018).
13 Introduction to quantile regression, alongside advantages to other approaches, such as being robust to outliers, heteroskedasticity, non-normality, etc., can be found in Koenker ( 2005), Davino, Furno and Vistocco ( 2013), or Koenker and Bassett ( 1978).
14 GDP deflator was used to deflate the original nominal GDP series.
15 See Škrinjarić and Bukovšak ( 2022) for Croatia’s best individual credit dynamics indicators.
16 See Škrinjarić ( 2022a; 2023b) for the composite indicator for Croatia.
17 SIC values resulted in the same ordering. As these are just ordinary regressions, the idea is to see the tradeoff between the explanatory power of the model versus the number of parameters included in the model. Information criteria give us this information.
18 I.e., we compare four models M_i, where i stands for how many lags of all variables on the right-hand side
(RHS) of the ordered probit equation symbol were included. The explanatory variables included lagged value
of the real growth itself, as it is usually put in GaR modelling, and the other variables included were: HIFS
and YoY change of the credit-to-GDP ratio. E.g., M_3 means that all variables on the RHS were included with
lags 1, 2 and 3 to regress the MPI dynamics on.
19 Although we are mostly interested in comparing the median and the GaR value, i.e. calculating distance
to tail, we are showing all quantiles in graph 9 to get a better picture on the stability of the beta coefficients.
20 We use MPI “shocks” from a variable that was defined with values being equal to +1 or -1 (before purging out effects of other variables), and as we are not using moving sums as some studies do, there is no reason to believe that a measure that takes +1 value in, e.g. 1Q 2019 should have effects 12Q ahead, as this is
way overstretching the effects that macroprudential policy has. Using moving sums or similar transformations
would include a greater autocorrelation, i.e. memory of the variable and thus it would make sense to look at
a longer time horizon. But to observe effects 3 years in future is really overstretching and we don’t hear central banks saying that the macroprudential measures have significant effects on the GDP growth or in general
the real economy so long in the future.
21 Here, we depict the median value of DTT as just a statistical value. It does not replace the theoretical “optimal” DTT value.
22 Some initial steps have been done by Vandenbussche, Vogel and Detragiache ( 2015) and followed by Eller et al. ( 2020).
Disclosure statement
There are no financial or other potential conflicts of interest.
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