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WORKING PAPER NO: 16/12 A Dynamic Approach to Analyzing the Effect of the Global Crisis on NonPerforming Loans: Evidence from the Turkish Banking Sector April 2016 Vuslat US © Central Bank of the Republic of Turkey 2016 Address: Central Bank of the Republic of Turkey Head Office Research and Monetary Policy Department İstiklal Caddesi No: 10 Ulus, 06100 Ankara, Turkey Phone: +90 312 507 54 02 Facsimile: +90 312 507 57 33 The views expressed in this working paper are those of the author(s) and do not necessarily represent the official views of the Central Bank of the Republic of Turkey. The Working Paper Series are externally refereed. The refereeing process is managed by the Research and Monetary Policy Department. A DYNAMIC APPROACH TO ANALYZING THE EFFECT OF THE GLOBAL CRISIS ON NON-PERFORMING LOANS: EVIDENCE FROM THE TURKISH BANKING SECTOR Vuslat US* ABSTRACT This paper analyzes the effect of the global crisis on the determinants of non-performing loans in the Turkish banking sector by using dynamic panel estimation techniques. Empirical findings suggest that non-performing loans present persistence, which is more evident after the crisis, while other regressors have also persistent effects in the postcrisis period. Moreover, non-performing loans are mostly shaped by bank-specific variables before the crisis, whereas, after the crisis, non-performing loans are also driven by macroeconomic and policy-related variables. In particular, the post-crisis significance of GDP, policy rate and sovereign debt shows that robust economic activity, tight monetary policy and strong fiscal balances restrict non-performing loans, thereby enhancing financial stability. On the other hand, the significance of inflation in both subperiods indicates that commitment to price stability objective is indispensable for limiting non-performing loans and promoting financial stability. In the period ahead, the speed and the direction of normalization in global monetary policies may determine the course of financial conditions, which therefore have implications regarding non-performing loan dynamics and financial stability. Keywords: Global crisis, Non-performing loans, Turkish banking sector, Dynamic panel estimation, Persistence, Financial stability, Price stability, Normalization. JEL Codes: C23, E44, E52, G10, G21. * Central Bank of the Republic of Turkey, Research and Monetary Policy Department, Istiklal Cad. No. 10 Ulus/Ankara 06100 Turkey. Phone: +90 (312) 5075423, e-mail: [email protected]. 1. Introduction Analyzing the determinants of non-performing loans (NPLs) is crucial for diagnosing weaknesses in financial stability. This has gained importance especially after the global crisis, which has drawn more attention to factors that may trigger banking crisis and to the consequences of banking system instability (Agnello and Sousa, 2012; Festic et al., 2011; Nkusu, 2011; Castro, 2013, Reinhart and Rogoff, 2010). Turkey represents such a case where the global crisis had notable effects on the banking sector structure and the course of NPLs.1 This evidence necessitates a thorough understanding of the NPL dynamics and also brings an important question. In particular, what is the effect of the global crisis on the determinants of NPLs? Answering this question is crucial given the ongoing normalization of global monetary policies, which prompts potential challenges and prospects for the Turkish economy via possibly tighter financial conditions. This is explored in the spirit of earlier works2 that link NPL dynamics to selected determinants. Consequently, the effect of the global crisis is assessed by a sub-period analysis, which shows whether the significance of these determinants changes before and after the crisis. Given the use of quarterly data due to short span of time in the pre-crisis and the post-crisis periods, this may raise the issue of persistence in NPLs, which necessitates adopting dynamic panel estimation techniques.3 The paper proceeds as follows: The next section presents data, the dynamic panel data estimation and empirical findings, while the last section concludes this paper. All tables are given in the Appendix. 2. Data, Dynamic Panel Data Estimation and Empirical Findings 2.1. Data The analysis utilizes quarterly data during 2002Q4 and 2013Q3. Table A1 displays the data description. The study includes a balanced panel of 21 deposits banks, while other deposit banks are excluded due to missing data. Bank-specific data are obtained from the Banks Association of Turkey. Data on macroeconomic and policy-related variables are compiled from the Central Bank of the Republic of Turkey (CBRT) and the Undersecretariat of Turkish Treasury. 1 CBRT (2010), Selçuk (2010) and Afşar (2011) show that NPLs increased sharply, while Ganioğlu and Us (2014) and Us (2015a) report that the structure of the Turkish banking sector has changed after the crisis. 2 Greenidge and Grosvenor (2010), Salas and Saurina (2002), Jiménez and Saurina (2006), Ranjan and Dhal (2003), Louzis et al. (2012), Rinaldi and Sanchis-Arellano (2006), Berge and Boye (2007), Nkusu (2011), Berger and DeYoung (1997), Podpiera and Weill (2008), Sinkey and Greenwalt (1991), Kwan and Eisenbeis (1995), Hassan (1993), Brewer et al. (1996), Gallo et al. (1996), Angbazo (1997), Hassan et al. (1994), Corsetti et al. (1999) and Breuer (2006) are important works along this line. 3 Beck et al. (2015), Chaibi and Ftiti (2015), Klein (2013), Louzis et al. (2012), Abid et al. (2014), Salas and Saurina (2002), Jiménez and Saurina (2006) and Rinaldi and Sanchis-Arellano (2006) are previous studies that assume persistence in NPLs. This is because NPLs are not immediately written off from banks’ balance sheets, which implies that lagged NPL terms may have significant impact on current NPLs. This requires utilizing dynamic panel data estimation, which includes lagged dependent variable as regressor. 1 2. 2 Dynamic Panel Data Estimation The determinants of NPLs can be captured by the following general equation: , = + , + , + + , (1) Where is the NPL ratio of bank , is the NPL ratio of bank at time ; , at time − 1; , is the matrix of bank-specific, macroeconomic and policy-related variables of bank at time ; is the constant term; and and are the corresponding coefficient vectors, where the former is expected to be positive and less than unity. is the unobserved individual (bank-specific) effect and , is the idiosyncratic error term, both following i.i.d. processes with mean 0 and variances and , respectively. Traditional panel data estimators like pooled OLS, fixed effects or random effects produce biased and inconsistent parameter estimates when applied to above specification. In fact, . Also, other explanatory variables may , is inherently correlated with not be strictly exogenous, which implies that they are correlated with past and possibly current realizations of the error term. Furthermore, the specification may be subject to fixed individual effects besides heteroscedasticity and autocorrelation within individuals. These biases can be eliminated via the Generalized Method of Moments (GMM) as proposed by Arellano and Bond (1991), which developed a difference GMM estimator where the lagged levels of the regressors are used as instruments for the above equation in first differences. Arellano and Bover (1995) and Blundell and Bond (1998) extended Arellano and Bond (1991) by differencing the instruments instead of the regressors in order to make them exogenous to the fixed effects. This leads from the difference GMM to the system GMM estimator, which is a joint estimation of the equation in levels and in first differences. Yet, Roodman (2009) discusses that the difference and the system GMM may result in instrument proliferation, which causes some asymptotic results and related specification tests to be misleading. Hence, Roodman (2009) imposes the moment condition that the covariance between and , equals 0 for s≥2 to avoid the , problem of instrument proliferation and overfitting. 2.3. Empirical Findings Empirical findings are presented in Table A2. Accordingly, equation (1) is estimated using Arellano-Bover/Blundell-Bond estimator (system GMM) where the available lags of the dependent variable and the lagged values of the exogenous regressors are used as instruments. For robustness, Roodman estimation results are also reported. To eliminate downward bias due to possible instrument proliferation, the standard errors incorporate the Windmeijer (2005) correction. The estimation also tests explanatory power of other regressors in lagged terms and reports the statistically significant results. 2 Estimations are conducted for the overall sample and by sub-periods for the pre-crisis and the post-crisis periods, which cover 2002Q4-2008Q3 and 2008Q4-2013Q3, respectively. The consistency of the GMM estimator relies on the validity of moment conditions, which assume that the error terms are not serially correlated and the instruments are appropriate. Hence, one should reject the Arellano-Bond first-order serial correlation and do not reject the second-order serial correlation. Furthermore, Sargan test results should indicate that overidentifying restrictions are valid. Accordingly, the pvalues of the AR(1) and AR(2) tests show no serial correlation except for the post-crisis system GMM estimation, while Sargan tests justify instrument validity in all specifications excluding the post-crisis Roodman estimation. Overall, the estimated models are able to explain the dynamics of non-performing loans in the Turkish banking sector reasonably well where the signs of the estimated coefficients are compatible with the economic intuition. Lagged NPL is positively significant in all estimations, which confirms the persistence in NPLs. The relatively larger size of the post-crisis coefficient shows that the persistence gets even stronger after the crisis. Lending is negatively significant in the overall period and also in sub-periods. This supports Khemraj and Pasha (2009), which observe a negative relation between lending and NPLs. Even though the post-crisis coefficient is smaller, lending has a more persistent yet positive impact in this period as implied by the significant lagged term. Capital adequacy is significant only before the crisis, where the effect is negative, complying with the moral hazard hypothesis (Berger and DeYoung, 1997). This asserts that thinly capitalized banks generally take riskier loans, which could potentially lead to higher NPLs as confirmed by Keeton and Morris (1987) and Salas and Saurina (2002). Profitability is also significant only before the crisis with a positive impact. This validates García-Marco and Robles-Fernández (2008), which argue that profitmaximizing policies will be accompanied by higher levels of risk, inducing greater NPLs. Inefficiency is negatively significant in the overall period and in sub-periods, which confirms the skimping hypothesis that conjectures increasing number of NPLs for higher efficiency (Berger and DeYoung, 1997, Rossi et al., 2008). The effect of inefficiency is weaker after the crisis given the smaller coefficient. Bank size is also significant in the overall period and in sub-periods. The effect is negative in compliance with the diversification hypothesis that envisions lower NPLs for larger banks (Louzis et al., 2012; Joseph et al., 2012; Hu et al., 2004; Salas and Saurina, 2002; Ranjan and Dhal, 2003; Saunders et al., 1990; Chen et al., 1998; Cebenoyan et al., 1999; Megginson, 2005). Moreover, bank size becomes even more important after the crisis as implied by the larger coefficient and the significant lagged term, which is yet positive. 3 As for macroeconomic and policy-related determinants, inflation is extremely influential on NPL as it is positively significant in all estimations. This indicates that higher inflation reduces the borrowers’ real income, causing higher NPLs (Rinaldi and Sanchis-Arellano, 2006; Fofack, 2005, Abid et al., 2014; Klein, 2013). Yet, NPL is less responsive to inflation after the crisis as the coefficient is considerably smaller in this period. GDP is negatively significant in the overall period and also after the crisis. This supports Salas and Saurina (2002), Dash and Kabra (2010), Jiménez and Saurina (2006), Khemraj and Pasha (2009) and Fofack (2005), documenting countercyclicality of NPLs as higher growth expands debt servicing capacity of borrowers. GDP is more persistent after the crisis as the lagged GDP term is also significant. Policy rate is negatively significant in the overall analysis and after the crisis. This suggests that monetary tightening in the post-crisis period4 leads to prudent banking behavior, which improves the quality of lending, thereby reducing NPLs. Finally, sovereign debt has a positively significant coefficient in the overall analysis and after the crisis, which conforms Louzis et al. (2012), Ali and Daly (2010) and Makri et al. (2014), reporting that higher sovereign debt raises NPLs. On the other hand, exchange rate has no effect on NPL contradicting with Chaibi and Ftiti (2015), Kalluci and Kodra (2010), Moinescu and Codirlaşu (2012), Beck et al. (2013) and Fofack (2005), which assert that depreciation of the local currency may result in higher NPLs. This may be owed to the fact that FX-loans constitute a smaller percentage of total loans in the Turkish economy.5 3. Conclusion This paper examines the effect of the global crisis on the determinants of NPLs in the Turkish banking sector and shows that NPL dynamics have changed after the crisis. In particular, NPLs are mostly determined by bank-specific factors before the crisis, while macroeconomic and policy-related factors are more influential on NPLs after the crisis. Furthermore, dynamic panel estimation results reveal that NPLs are more persistent after the crisis, while other variables have also persistent effects on NPLs during this period. Accordingly, the post-crisis significance of GDP, policy rate and sovereign debt shows that robust economic activity, tight monetary policy and strong fiscal balances gained importance after the crisis in limiting non-performing loans and enhancing financial stability. However, inflation is significant both before and after the crisis, which implies that maintaining the price stability objective reduces NPLs, thus promoting financial stability. 4 Us (2015b) provides an overview of the CBRT’s tight monetary policy conduct after the crisis, which also observes financial stability. 5 FX lending to resident individuals was prohibited in 2009, which caused FX-loans to decrease substantially. 4 Empirical findings indicate that accurate policy design is critical to minimizing NPLs. This includes not only monetary and fiscal policy, but also macroprudential policies, which aim at improving the stability of the financial system. Obviously, the implementation of such policies should occur in an environment of strong economic growth. Meanwhile, regulatory authorities should also focus on microprudential policies, which pertain to measures of risk management and identification of banks with potential impaired loans. In the period ahead, global policy normalization, which will probably affect financial conditions, may also change the course of NPLs. So, future research may explore the sensitivity of NPLs to financial conditions, both domestic and global. Prospective research may also analyze NPLs for each loan type individually. This may help policymakers to directly identify the loan type that is likely to generate NPLs. Similarly, further research can be extended by an ownership-breakdown. This may facilitate to recognize structural factors inducing NPLs, which, however, is beyond the scope of this paper. 5 REFERENCES Abid, L., M.N. Ouertani and S. 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Dhal, 2003, Non-Performing Loans and Terms of Credit of Public Sector Banks in India: An Empirical Assessment, Reserve Bank of India Occasional Papers, 24(3): 81-121. Reinhart, C. and K. Rogoff, 2010, From Financial Crash to Debt Crisis, NBER Working Paper No. 15795. Rinaldi, L. and A. Sanchis-Arellano, 2006, Household Debt Sustainability: What Explains Household Non-Performing Loans? An Empirical Analysis, ECB Working Paper No. 570. Roodman, D., 2009, How to do xtabond2: An introduction to difference and system GMM in Stata, Stata Journal, 9(1): 86-136. Rossi, S., M. Schwaiger and G. Winkler, 2008, Linking Managerial Behaviour to Cost and Profit Efficiency in the Banking Sectors of Central and Eastern European Countries, Kredit und Capital, 41(4): 598-629. Salas, V. and J. Saurina, 2002, Credit Risk in Two Institutional Regimes: Spanish Commercial and Savings Banks, Journal of Financial Services Research, 22(3): 203224. Saunders, A., E. Strock and N.G. Travlos, 1990, Ownership Structure, Deregulation, and Bank Risk Taking, Journal of Finance, 45(2): 643-654. Selçuk, B., 2010, Küresel Krizin Türk Finans Sektörü Üzerindeki Etkileri (in Turkish), Ekonomi Bilimleri Dergisi, 2(2): 21-27. Sinkey, J.F. and M.B. Greenwalt, 1991, Loan-Loss Experience and Risk-Taking Behavior at Large Commercial Banks, Journal of Financial Services Research, 5(1): 43-59. Us, V., 2015a, Banking Sector Performance in Turkey before and after the Global Crisis, İktisat İşletme ve Finans, 30(353): 45-74. 9 , 2015b, Assessing the Monetary Policy Stance in Turkey Using the Natural Interest Rate, İktisat İşletme ve Finans, 30(356): 39-64. Windmeijer, F., 2005, A finite sample correction for the variance of linear efficient twostep GMM estimators, Journal of Econometrics, 126(1): 25-51. 10 Appendix Table A1. Description of Variables VARIABLES DESCRIPTION Dependent Variable NPL Overdue loans to total loans and receivables Independent Variables NPL(-1) Lagged NPL LENDING Total loans and receivables to total assets LENDING(-1) Lagged lending CAPITAL ADEQUACY Shareholders’ equity to total assets PROFITABILITY Net profits (loss) to total assets INEFFICIENCY Other operating expenses to total assets BANK SIZE Total assets to banking sector’s assets BANK SIZE(-1) Lagged bank size INFLATION Year-on-year change in the consumer price index in logs GDP Year-on-year change in the real GDP in logs GDP(-1) Lagged GDP POLICY RATE CBRT policy rate SOVEREIGN DEBT Central government domestic debt stock to GDP EXCHANGE RATE Quarter-on-quarter change in USD/TL rate in logs 11 Table A2. Estimation Results NPL(-1) LENDING LENDING(-1) CAPITAL ADEQUACY PROFITABILITY INEFFICIENCY BANK SIZE BANK SIZE(-1) INFLATION GDP GDP(-1) POLICY RATE SOVEREIGN DEBT EXCHANGE RATE CONSTANT Wald chi2 Prob>chi2 AR(1) AR(2) Sargan No of Obs. Overall System Roodman GMM GMM 0.739*** 0.785*** (0.037) (0.034) -0.035*** -0.018 (0.009) (0.012) Pre-Crisis Period System Roodman GMM GMM 0.763*** 0.793*** (0.027) (0.027) -0.084** -0.019 (0.033) (0.015) - - - - -0.160 (0.124) 0.199 (0.153) -0.079* (0.043) -0.151** (0.075) -0.133 (0.088) 0.210 (0.171) -0.068 (0.049) -0.080* (0.043) -0.128* (0.040) 0.223*** (0.123) -0.095** (0.041) -0.285*** (0.059) -0.092** (0.042) 0.172 (0.114) -0.043 (0.039) -0.060 (0.048) - - - - 0.184** (0.079) -0.073*** (0.012) 0.149* (0.078) -0.072*** (0.011) 0.194** (0.091) 0.052 (0.076) 0.174* (0.091) 0.065 (0.069) - - - - -0.079*** (0.022) 0.141** (0.064) -0.013 (0.010) 0.008 (0.014) 3671.12 0.0000 0.0885 0.7328 0.9236 903 -0.068*** (0.022) 0.088*** (0.031) -0.008 (0.012) 0.009 (0.013) 21559.75 0.0000 0.064 0.664 0.945 903 -0.068 (0.068) -0.042 (0.068) -0.043 (0.028) 0.084** (0.036) 3400.93 0.0000 0.1096 0.5545 0.9532 483 -0.040 (0.074) 0.006 (0.043) -0.032 (0.030) 0.014 (0.017) 20120.58 0.0000 0.093 0.522 0.764 483 *,**,*** denote statistical significance for p<0.1, p<0.05 and p<0.01, respectively. Robust standard errors are in parentheses. 12 Post-Crisis Period System Roodman GMM GMM 0.893*** 0.946*** (0.030) (0.016) -0.034*** -0.040*** (0.011) (0.011) 0.034*** 0.039*** (0.010) (0.011) -0.020 -0.009 (0.016) (0.013) 0.065 0.018 (0.043) (0.032) -0.064** -0.037* (0.028) (0.020) -0.506*** -0.428*** (0.149) (0.125) 0.469*** 0.410*** (0.148) (0.124) 0.053** 0.048** (0.021) (0.020) -0.043*** -0.036*** (0.010) (0.011) -0.021*** -0.023*** (0.007) (0.007) -0.025** -0.011* (0.012) (0.020) 0.058** 0.029 (0.026) (0.015) 0.007 0.008 (0.006) (0.006) -0.008 -0.004 (0.010) (0.006) 8843.40 28496.25 0.0000 0.0000 0.0014 0.001 0.7694 0.843 0.1256 0.078 420 420 Central Bank of the Republic of Turkey Recent Working Papers The complete list of Working Paper series can be found at Bank’s website (http://www.tcmb.gov.tr). 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