后危机时代商业银行不良资产形成因素的实证研究——基于江西省数据的经验分析

2009年,我国信贷高增长引致未来银行不良资产大量积聚的潜在风险引起了各方关注。在后金融危机背景下,研究商业银行不良贷款的现状,发掘不良贷款存在的根源,对信贷风险管理具有重要的现实意义。本文在回顾以前研究成果的基础上,试图以更加全面的视角,从宏观经济金融环境、宏观调控政策以及银行业运行情况等三个方面深入分析商业银行不良资产的影响因素。文章运用协整分析、格兰杰因素检验和脉冲响应模型对资产价格、固定资产投资、通胀率、存款准备金率、基准利率、银行利润等指标与不良贷款率（或不良贷款余额）的因果关系、影响程度进行了实证分析。结果表明,宏观经济金融形势的变化和货币政策调整都是影响不良贷款变化的重要原因,而不良贷款率的变化对商业银行利润影响明显。     

Problem bank loans, conflicts of interest, and institutions

I consider problem bank loans as the outcome of decisions made by banks in the dual role they serve as financial intermediaries. This dual role necessarily introduces conflicts of interest that can lead to bank mismanagement and consequently problem bank loans. Because bank activities take place within the tangible and intangible structure of institutions, institutions may affect the quality of bank loans. I consider legal, political, sociological, economic, and banking institutions and explore their contribution to problem bank loans. I find support that a variety of institutions impact the share of bank assets that are non-performing.     

Credit to government and banking sector performance

The impact of credit to government on three aspects of banking sector performance – its deepening over time, profitability, and efficiency – is examined for 142 countries. Country regressions suggest a sizeable negative effect of credit to government on bank deepening in developing countries, but no impact in advanced economies. Bank regressions find that credit to government raises the profitability but reduces the efficiency of banks in developing countries; in advanced economies, there appears to be no impact on profitability but a positive one on efficiency.     

Discrimination in Lending: Theory and Evidence

Using a general equilibrium model of credit market discrimination, I find that both taste-based discrimination and statistical discrimination have similar predictions for the intergroup differences in loan terms. The commonly held view has been that if taste-based discrimination exists, loans approved to minority borrowers will have higher expected profitability than those to majorities with comparable credit background. I show that the validity of this profitability view depends crucially on how expected loan profitability is measured. I also show that taste-based discrimination must exist if loans to minority borrowers have higher expected rates of return or lower expected rates of default loss than those to majorities with the same exogenous characteristics observed by lender at the time of loan originations. My analysis suggests that the valid method to test for taste-based discrimination should be reduced-form regressions. Empirically, I fail to find supporting evidence for the existence of taste-based discrimination.     

我国上市城市商业银行信贷风险实证研究

信贷风险管理能力是我国城市商业银行核心竞争力的主要决定因素之一,良好的信贷风险管理能力有助于城商行稳健运营。本文通过对我国上市城商行信贷风险进行实证分析,揭示我国上市城商行不良贷款率与其影响因素之间的关系,并提出加强信贷风险管理的相应建议措施。     

Do banks appraise internal capital markets during credit shocks? Evidence from the Greek crisis

Using data of bank loans to Greek firms during the Greek crisis we provide evidence that affiliated firms, having access to the internal capital markets of their associated group, are less likely to default on their loans. Furthermore, banks require lower loan collateral coverage from affiliated firms and are less likely to downgrade the affiliates’ credit profile. Finally, banks are more likely to show forbearance to affiliated firms with non-performing loans. The results are consistent with the view that banks manage their relationships with firms in a business group jointly, as opposed to viewing each firm as an independent entity. Our findings also suggest that the value of risk sharing through internal capital markets increases when external financing is scarce.     

A macro stress test model of credit risk for the Brazilian banking sector

This paper proposes a model to conduct macro stress test of credit risk for the banking sector based on scenario analysis. We employ an original bank-level data set that splits bank credit portfolios in 21 granular categories, covering household and corporate loans. The results corroborate the presence of a strong procyclical behavior of credit quality, and show a robust negative relationship between the logistic transformation of non-performing loans (NPLs) and GDP growth, with a lag response of up to three quarters. The results also indicate that the procyclical behavior of loan quality varies across credit types. This is novel in the literature and suggests that banks with larger exposures to highly procyclical credit types and economic sectors would tend to undergo sharper deterioration in the quality of their credit portfolios during an economic downturn. Lack of sufficient portfolio granularity in macro stress testing fails to capture these effects and thus introduces a source of bias that tends to underestimate the tail losses stemming from the riskier banks in a system.     

Credit unions vs. commercial banks,who takes more risk?

A unique feature of the financial services industry is that both shareholder-owned banks and member-owned credit unions coexist and compete against each other. In this study, we investigate two research questions. First, we compare risk-taking by banks and credit unions, with an additional consideration as to how regulatory oversight (state or federal) relates to such risk-taking. Second, we examine how competition affects the difference in risk-taking between these two types of financial institutions. To answer both questions, we rely on a matched sample (by loan type, size, and county) of commercial banks and credit unions, covering the period between 2010 and 2017. We use three empirical proxies for risk-taking, the Z-score, measuring an institution’s insolvency risk, as well as the ratios of non-performing loans to total loans and loan charge-offs to total loans, measuring the credit risk. Our results suggest that banks tend to engage in more risk-taking than credit unions; however, state regulatory oversight reduces the risk-taking gap, especially in terms of the Z-score. We further find that competition induces different risk-taking behaviors in banks and credit unions. Our results are robust to several alternative specifications.     

Does political pressure matter in bank lending? Evidence from China

Using provincial data from China between 2002 and 2011, we find substantial evidence indicating a positive association between the growth of bank loans issued by commercial banks and the political pressures faced by provincial leaders. This association is particularly true for state‐owned banks, which are much more politically pressurized than others, but is relatively attenuated in provinces with a more developed banking sector. We also find that bank loans issued under greater political pressures are less commercially oriented and have lower quality. Our findings are robust to a variety of sensitivity analyses and alternative measures of political pressure. Overall, our study contribute to a growing literature emphasizing the role of the political incentives of government officials in fuelling economic growth through credit allocation.     

Quality of information disclosure,property rights,and bank loans: A bank heterogeneity perspective

Using the context of the financial reform and the development of the non-state sector in China in the past decade, we examine the roles that the quality of information disclosure and property rights play in the allocation of different types of bank credit. We find that foreign banks and policy banks exercise “financial discrimination,” and that local commercial banks, large state-owned commercial banks, national joint-stock banks, local city commercial banks, and rural commercial banks not only exercise financial discrimination but also provide significant “financial support” to non-state-owned enterprises by providing more lending opportunities and larger loans. However, when enterprises commit information disclosure violations, the local commercial banks, national joint-stock banks, local city commercial banks, and rural commercial banks reverse their credit decisions and begin to exercise financial discrimination against non-state-owned enterprises. At the same time, large state-owned commercial banks continue to provide financial support to non-state-owned enterprises. We also find that the quality of the information disclosed by enterprises has a moderating effect rather than an intermediary effect on the relationship between property rights and bank loans. Overall, the results of this paper shine new light on the market-oriented reform of the banking industry, and provide new empirical evidence for the presence of financial discrimination in the supply of bank credit. Our findings also have practical implications for solving the financing difficulties of non-state-owned enterprises.     

Herding behaviour in the Australian loan market and its impact on bank loan quality

We examine the effect of herding behaviour on the credit quality of bank loans in Australia. We find that bank herding varies with different types of loans. It tends to be more prevalent in owner‐occupied housing loans and credit cards than other types of loans. During the global financial crisis period, herding in owner‐occupied housing loans was most pronounced due to the flight‐to‐quality phenomenon in the housing sector. Furthermore, we find that the big four banks tend to herd more than smaller and regional banks. Bank herding behaviour is countercyclical, as it is negatively related to real GDP growth and the cost of funding but is positively related to market risk. Regulatory capital requirements may also encourage herding as banks are required to hold less risk‐weighted capital for residential loans. Most importantly, bank herding is related to higher impaired assets and therefore lower loan quality. Our findings may have implications for policymakers and bank regulators.     

Derivatives holdings and systemic risk in the U.S. banking sector

This paper studies the impact of the banks’ portfolio holdings of financial derivatives on the banks’ individual contribution to systemic risk over and above the effect of variables related to size, interconnectedness, substitutability, and other balance sheet information. Using a sample of 95 U.S. bank holding companies from 2002 to 2011, we compare five measures of the banks’ contribution to systemic risk and find that the new measure proposed in this study, Net Shapley Value, outperforms the others. Using this measure we find that banks’ aggregate holdings of five classes of derivatives do not exhibit a significant effect on the bank’s contribution to systemic risk. On the contrary, the banks’ holdings of certain specific types of derivatives such as foreign exchange and credit derivatives increase the banks contributions to systemic risk whereas holdings of interest rate derivatives decrease it. Nevertheless, the proportion of non-performing loans over total loans and the leverage ratio have much stronger impact on systemic risk than derivatives holdings. Therefore, the derivatives’ impact plays a second fiddle in comparison with traditional banking activities related to the former two items.     

Capital shocks, bank asset allocation, and the revised Basel Accord

In contrast to the 1988 Basel Accord (Basel I), the revised risk-based capital standards (Basel II) propose regulatory capital requirements based on credit ratings. This paper develops a theoretical model to analyze how banks will adjust their low and high credit risk commercial loans under the proposed newer standard. Capital-constrained banks respond to an adverse capital shock by reducing high credit risk loans, while under certain circumstances, low credit risk loans may actually increase. When compared to Basel I, it is shown that high-risk loans are reduced more under Basel II, but whether a bank reduces total lending more under Basel I or under the revised standards depends on a complex interaction of factors.     

Banks as information specialists: The case of hospital lending

This study analyzes data from the US hospital industry for evidence that banks enjoy informational advantages over direct lenders. In a multivariate analysis, we find a strong positive relationship between bank loans (as a share of total borrowing) and profitability among hospitals widely perceived as financially weak. Thus, among such hospitals, reliance on bank loans suggests the presence of hidden factors that enhance the hospital's financial standing. This supports the view that financial intermediaries are information specialists.     

Bad luck or bad management? Emerging banking market experience

A large number of bank failures occurred in transition countries during the 1990s and at the beginning of the 2000s. These were related to increases in non-performing loans and deteriorated cost efficiency of banks. This paper addresses the question of the causality between non-performing loans and cost efficiency in order to examine whether either of these factors is the deep determinant of bank failures. We extend the Granger-causality model developed by [Berger, A., DeYoung, R., 1997. Problem loans and cost efficiency in commercial banks. J. Banking Finance 21, 849–870] by applying GMM dynamic panel estimators on a panel of Czech banks between 1994 and 2005. Our findings support the bad management hypothesis, according to which deteriorations in cost efficiency precede increases in non-performing loans. Banking supervisors should consequently focus on enhanced cost efficiency of banks in order to reduce the likelihood of bank failures in transition countries.     

财政存款、银行竞争与僵尸企业形成

银行以优惠利率贷款为低质企业“输血”,是企业僵尸化的重要成因。然而,基于中国背景的文献,对银行“输血”动机的研究并不充分,本文从地方财政存款影响银行信贷分配的视角,分析僵尸企业形成的内在机理。首先,通过构建理论模型对银行竞争财政存款及影响企业融资和投资绩效进而僵尸化的逻辑进行刻画,而后依据省份财政存款、银行竞争与微观企业财务数据,对理论推论进行了验证。研究发现,财政存款占当地存款比重越大,企业僵尸化概率越高,并且银行竞争助长了企业僵尸化。此外,基于工具变量估计处理了核心变量的内生性问题,并进行了多种稳健性检验。机制检验表明,财政存款的信贷分配效应,促使企业过度投资,导致经营绩效恶化,进而提高了企业僵尸化概率,银行竞争则会加剧该效应。本文拓展了财政存款的经济效应与僵尸企业形成方面的文献,对于僵尸企业治理有一定参考意义。     

Credit derivatives and bank credit supply

Credit derivatives are the latest in a series of innovations that have had a significant impact on credit markets. Using a micro data set of individual corporate loans, this paper explores whether use of credit derivatives is associated with an increase in bank credit supply. We find only limited evidence that greater use of credit derivatives is associated with greater supply of bank credit. The strongest effect is for large term loans—newly negotiated loan extensions to large corporate borrowers, with a largely negative impact on (previously negotiated) commitment lending. Even for large term borrowers, increases in the volume of credit are offset by higher spreads. These findings suggest that the benefits of the growth of credit derivatives may be narrow, accruing mainly to large firms that are likely to be “named credits” in these transactions. Finally, use of credit derivatives appears to be complementary to other forms of hedging by banks, though the banks most active in hedging appear to charge more for additional amounts of credit.     

Risk and efficiency in the Central and Eastern European banking industry under quantile analysis

This paper estimates cost efficiency in the banking industry of 11 Central and Eastern European (CEE) countries over the period 1998–2005 using a quantile regression analysis. Our purpose is to investigate for the first time whether cost efficiency in CEE banks differs across quantiles of the conditional distribution. We employ stochastic frontier analysis across quantiles using the Distribution-Free Approach. The reported evidence demonstrates lower efficiency scores for higher conditional distributions. The paper goes further into a second-stage analysis to investigate how risk, measured by non-performing loans and loans loss provisions, affects bank efficiency across quantiles. This second-stage analysis finds that risk asserts a negative impact on cost efficiency, especially in high-order quantiles. Finally, the paper investigates the relationship between bank-specific ‘z’ variables, such as structural reforms, bank concentration and profitability, and cost efficiency across quantiles.     

How Do Firms Choose Between Intermediary and Supplier Finance?

This paper examines firms’ short‐term financing choices between intermediated loans and trade credit. I test two sets of empirical hypotheses: 1) hypotheses concerning the cross‐sectional differences in the level of intermediary finance for firms that use different levels of trade credit and 2) hypotheses concerning the dynamics of trade credit growth. I find strong evidence that for firms with high agency costs, the use of trade credit facilitates access to conventional bank loans. The evidence is consistent with theories based on the signaling role of trade credit provision and suppliers’ liquidation advantage.     

财政存款、银行竞争与僵尸企业形成

银行以优惠利率贷款为低质企业“输血”,是企业僵尸化的重要成因。然而,基于中国背景的文献,对银行“输血”动机的研究并不充分,本文从地方财政存款影响银行信贷分配的视角,分析僵尸企业形成的内在机理。首先,通过构建理论模型对银行竞争财政存款及影响企业融资和投资绩效进而僵尸化的逻辑进行刻画,而后依据省份财政存款、银行竞争与微观企业财务数据,对理论推论进行了验证。研究发现,财政存款占当地存款比重越大,企业僵尸化概率越高,并且银行竞争助长了企业僵尸化。此外,基于工具变量估计处理了核心变量的内生性问题,并进行了多种稳健性检验。机制检验表明,财政存款的信贷分配效应,促使企业过度投资,导致经营绩效恶化,进而提高了企业僵尸化概率,银行竞争则会加剧该效应。本文拓展了财政存款的经济效应与僵尸企业形成方面的文献,对于僵尸企业治理有一定参考意义。