我国商业银行经营投资银行业务对风险影响的实证研究

本文以2009-2018年19家商业银行为研究对象,运用波动性分析、相关性分析及面板数据回归分析方法,考察了经营投资银行业务对银行风险的影响。研究结果表明,投资银行收入无明显周期性趋势,波动性明显高于利息净收入,经营投资银行业务会加剧银行业收入的不确定性,但由于收入占比较小,投资银行业务并非造成我国银行业收入波动的主要因素。多数银行的投资银行收入与利息净收入表现为正相关性,银行难以通过经营投资银行业务实现风险分散目的。投资银行业务对银行风险影响的回归结果较为显著,随着投资银行收入在银行收入结构中的权重越来越大,银行多元化收入程度随之加深,银行风险也随之下降。     

US bank holding companies: Structure of activities and performance through the cycles

The development of market-based finance has supported a larger involvement of banks in non-banking activities over the last decades. Does diversification beyond “traditional” banking result in actual diversification of earning risks and superior risk-return profile? Existing studies on bank performance address the effect of earnings based on accounting types and for specific time periods. With the exception of proprietary investments and financial leverage, knowledge with regard to underlying activities is scarce and little conclusive to date. Other studies, mainly stemming from central banks, do not focus on activity types or risk-return but evidence a marked influence of economic conditions and financial markets on banks' income.The paper proposes a twofold original contribution by addressing the influence of economic conditions and financial markets on specific activities conducted by banks. Based on granular data from a panel of US Bank Holding Companies (BHC), it first aims at estimating profitabilities related to “traditional” banking services and to (customers) investment services conditional to the environment. The study is then extended by the simulation of multiple scenarios to assess the expected performance of activities (profitability and risk) as well as the extent of uncertainty. Diversification into investment services is found to improve the expected risk-return. Also, well calibrated interest rate mismatch (between assets and liabilities) further supports performance. Deviations from historical volatilities and correlations of influential variables may cause diversification benefits to vary. Results however also suggest that the uncertainty of ROE associated with such diversification is limited compared to banking alone.     

Financial structure change and banking income: A Canada–U.S. comparison

Data suggest that the Canadian financial structure, and particularly indirect finance (e.g., banking), have become more market-oriented. We associate this financial trend in part with the regulatory changes that have occurred in Canada since the 1980s. Financial intermediaries are increasingly involved with financial market activities—e.g. off-balance sheet (OBS) activities such as underwriting securities. In this article we analyze the noninterest income attributable to these financial market activities. We find that the variance of Canadian banks’ aggregate operating-income growth is rising because of the increased contribution of noninterest income. Overall, our analysis corroborates the U.S. findings of Stiroh and Rumble (Stiroh, K., 2006. A portfolio view of banking with interest and noninterest assets. Jounal of Money, Credit, and Banking 38, 1351–1361; Stiroh, K., Rumble, A., 2006. The darkside of diversification: the case of U.S. financial holding companies. Journal of Banking and Finance 30, 2131–2161): by contributing to banking income volatility, market-oriented activities do not necessarily yield straightforward diversification benefits to Canadian banks.     

Back to the basics in banking? A micro-analysis of banking system stability

This paper analyzes the relationship between banks’ divergent strategies toward specialization and diversification of financial activities and their ability to withstand a banking sector crash. We first generate market-based measures of banks’ systemic risk exposures using extreme value analysis. Systemic banking risk is measured as the tail beta, which equals the probability of a sharp decline in a bank’s stock price conditional on a crash in a banking index. Subsequently, the impact of (the correlation between) interest income and the components of non-interest income on this risk measure is assessed. The heterogeneity in extreme bank risk is attributed to differences in the scope of non-traditional banking activities: non-interest generating activities increase banks’ tail beta. In addition, smaller banks and better-capitalized banks are better able to withstand extremely adverse conditions. These relationships are stronger during turbulent times compared to normal economic conditions. Overall, diversifying financial activities under one umbrella institution does not improve banking system stability, which may explain why financial conglomerates trade at a discount.     

Risk-adjusted profitability and stability of Islamic and conventional banks: Does revenue diversification matter?

Revenue diversification in banking offers opportunities and threats. Recent academic research shows that disadvantages may outweigh advantages, in terms of both volatility of profitability and bank riskiness. Literature on this topic in emerging countries and in the field of Islamic finance is limited: our aim is to empirically test if revenue diversity affects Islamic banks differently than conventional institutions. We analyze the impact of income diversification on profitability and firm-risk of banks in selected OIC countries, in the period 2007–2016, using a comprehensive dataset of 47 Islamic and 154 conventional banks, through diverse measures and econometric approaches. We find that diversification provides lower rewards for Islamic banks than conventional banks, with effects that are stronger for accounting-based measures rather than market-based metrics. Shares of non-interest income positively contribute to profitability regardless of the business model, whereas income diversification shows a not significant effect on the risk-adjusted profitability of Islamic banks. Moreover, we do not find any relationship between income diversification and stability for both conventional and Islamic banks.     

Bank size, market concentration, and bank earnings volatility in the US

We examine whether bank earnings volatility depends on bank size and the degree of concentration in the banking sector. Using quarterly data for non-investment banks in the United States for the period 2004Q1-2009Q4 and controlling for the quality of management, leverage, and diversification, we find that bank size reduces return volatility. The negative impact of bank size on bank earnings volatility decreases (in absolute terms) with market concentration. We also find that larger banks located in concentrated markets have experienced higher volatility during the recent financial crisis.     

Are there diversification benefits of increasing noninterest income in the Chinese banking industry?

This paper assesses the potential diversification benefits of the increasing reliance on nontraditional business activities based on data from the Chinese banking industry in 1986–2008. At the aggregate level, there are diversification benefits of the increase in noninterest income. However, noninterest income has higher volatility and cyclicality than net interest income, and the marginal benefit of diversification decreases with the increase in noninterest income. At the bank level, the correlation coefficients of the growth rates of net interest income and noninterest income are mostly negative, which also suggests that there are diversification benefits of increasing the noninterest income. However, further model analysis indicates that the effect of the noninterest income share on the Chinese banking industry's revenue and risk is not significant. Overall, our findings suggest that noninterest income diversifies bank revenue, but increased reliance on noninterest income may worsen the risk/return trade-off for the Chinese banking industry.     

Income diversification and risk: Does ownership matter? An empirical examination of Indian banks

We examine the impact of ownership on income diversification and risk for Indian banks over the period 2001–2009. We investigate both the determinants of non-interest income and the impact of diversification on various profitability and insolvency risk measures for public sector, private domestic, and foreign banks. We document that ownership does matter in the pursuit of non-interest income. Relative to private domestic banks, public sector banks earn significantly less fee-income, while foreign banks report higher fee income. Public sector banks with higher levels of governmental ownership are significantly less likely to pursue non-interest income sources. Fee-based income significantly reduces risk, measured by profitability variables, for public sector banks. Default risk is also reduced for these banks. From a regulatory perspective, it appears that diversification benefits India’s public sector banks. Our research has implications for the changes in the risk profile for banks in emerging banking markets pursuing non-interest revenue sources.     

Bank earnings management and performance reporting of comprehensive income

FASB’s ASU 2011-05 mandated that comprehensive income (CI) and other comprehensive income (OCI) be reported in performance statements (a single income statement or a separate statement of CI) rather than equity statements. Employing a difference-in-differences research design with ASU 2011-05 as the treatment, I find that presenting accounting information in different statements affects bank earnings management, specifically, presenting CI and OCI in performance statements (especially in single-statements with net income) reduces earnings management through selective sales of available-for-sale (AFS) securities in the banking industry. I also find that the influence of ASU 2011-05 is primarily on banks with high equity incentives in the CEO’s compensation package or less CEO job security. Additional analyses suggest that performance reporting of CI and OCI increases the predictive ability of realized gains and losses of AFS securities; however, banks may manage loan loss provision as a substitute strategy when they have to decrease selective sales of AFS securities.     

Geographic diversification in banking

In the aftermath of the 2007–2009 crisis, banks claiming positive diversification benefits are being met with skepticism. Nevertheless, diversification might be important and sizable for some large internationally active banking groups. We use a universally applicable correlation matrix approach to calculate international diversification effects, in which bank subsidiaries are treated as individual assets of the banking group portfolio. We apply the framework to 49 of the world's largest banking groups with significant foreign business units over the 1992–2009 period. Focusing on the most important risk in banking, credit risk, we find that allowing for geographical diversification could reduce banks’ credit risk by 1.1% on average, with risk reduction ranging from negligible up to 8%.     

Small European banks: Benefits from diversification?

Motivated by the liberalisation and harmonisation of financial systems in Europe, we investigate whether the observed shift into non-interest income activities improves performance of small European credit institutions. Using a sample of 755 small banks for the period 1997–2003, we find no direct diversification benefits within and across business lines and an inverse association between non-interest income and bank performance. Our findings are robust to a set of sensitivity analyses using alternative samples and controlling for the regulatory environment. Furthermore, the results provide circumstantial evidence for the presence of economies of scale. The absence of benefits of diversification confirms findings for other banking markets and suggests small European banks enter lines of business where they currently lack expertise and experience. These results have implications for bank supervisors, regulators and bank managers.     

Bank Diversification and Overall Financial Strength: International Evidence

There are many studies in the finance and management literature that examine the impact of diversification on performance. Yet, the literature remains inconclusive as for the potential benefits in terms of risk and return. The present study aims to re‐examine this issue, while proposing a methodological framework that integrates various bank performance and risk indicators into a single measure of financial strength. Using an international sample of commercial banks, we find that diversification in terms of income, earning assets, and on‐ and off‐balance sheet activities influences positively their financial strength. We also find that income diversification can be more beneficial for banks operating in less developed countries compared to banks in advanced and major advanced economies. However, we observe the opposite in the case of diversification between off‐balance sheet and on‐balance sheet activities. Furthermore, the results reveal that income and earning assets diversification can mitigate the adverse effect of the financial crisis on bank financial strength. We continue to find a positive relationship between diversification and financial strength when we account for nesting effects, endogeneity, as well as when using an alternative approach for the construction of the financial strength indicator.     

Using clustering ensemble to identify banking business models

The business models of banks are often seen as the result of a variety of simultaneously determined managerial choices, such as those regarding the types of activities, funding sources, level of diversification, and size. Moreover, owing to the fuzziness of data and the possibility that some banks may combine features of different business models, the use of hard clustering methods has often led to poorly identified business models. In this paper we propose a framework to deal with these challenges based on an ensemble of three unsupervised clustering methods to identify banking business models: fuzzy c‐means (which allows us to handle fuzzy clustering), self‐organizing maps (which yield intuitive visual representations of the clusters), and partitioning around medoids (which circumvents the presence of data outliers). We set up our analysis in the context of the European banking sector, which has seen its regulators increasingly focused on examining the business models of supervised entities in the aftermath of the twin financial crises. In our empirical application, we find evidence of four distinct banking business models and further distinguish between banks with a clearly defined business model (core banks) and others (non‐core banks), as well as banks with a stable business model over time (persistent banks) and others (non‐persistent banks). Our proposed framework performs well under several robustness checks related with the sample, clustering methods, and variables used.     

Post‐merger strategy and performance: evidence from the US and European banking industries

The banking industry has one of the most active markets for mergers and acquisitions. However, little is known about the type of operational strategies adopted by banking firms in the years following a deal. For a sample of bidding banks in the USA and Europe, this study compares the design and performance implications of different post‐merger strategies in both geographical regions. Using accounting data, we show that European banks pursue a cost‐cutting strategy by increasing efficiency levels vis‐à‐vis non‐merging banks and by cutting back on both labour costs and lending activities. US banks, on the other hand, raise both interest and non‐interest income in the post‐merger period.     

Geographic Deregulation and Competition in the U.S. Banking Industry

We examine the effects of geographic deregulation on state‐level competition in U.S. banking markets over the period 1976‐2005. The empirical results confirm that the U.S. banks in general operated under monopolistic competition during the period examined. After partitioning the sample based on bank size we find that the market competition for large banks in Delaware, Oregon, and Rhode Island can be characterized as monopolistic while small banks in Arizona and Massachusetts seem to have operated under the conditions of perfect competition. The removal of geographic restrictions appears to have very limited and non‐uniform effect on state‐level competitive conduct. There is some evidence that the U.S. banking industry might have actually experienced a less competitive behavior in recent years due to increased market power of larger banks.     

Financial derivatives and bank risk: evidence from eighteen developed markets

We examine the relationship between equity risk and the use of financial derivatives with a sample of 555 banks from eighteen developed markets from 2006 to 2015. Our main findings suggest that banks’ use of financial derivatives increased their risk. This increase in risk can be driven by banks’ use of derivatives for speculative purposes, by suboptimal hedging to obtain hedge accounting status, or from accounting mismatches that generate volatility in earnings. We also show that this relationship is nonlinear. Too-Big-To-Fail banks and those that employ a traditional retail banking business model are subject to lower idiosyncratic risk. We address endogeneity concerns using instrumental variables capturing the use of derivatives with portfolio ranking. Overall, our study contributes to understanding the impact of derivatives use on bank risk and the risk consequences of a bank’s business model choice.     

Diversification of the Banking Firm

Diversification of banks and bank holding companies into nonbank product lines may reduce the risk to banking returns or cash flows provided appropriate portfolio conditions are satisfied. This study of bank and nonbank financial-service firms and nonfinancial corporations over the 1966–1985 period finds evidence consistent with the proposition that individual banking firm risk may be reduced through selected product-line diversification, particularly in the insurance and data processing fields. Moreover, there is evidence of less cash-flow sensitivity of selected nonbank product lines to exogenous economic and financial-market variables compared to banking firms. While public policy continues to insulate banking firms from most nonbank product and service lines, the potential benefits of risk reduction suggest that a careful review of current policy is needed.     

Strategic Management of Cost Efficiencies in Networks: Cross-country Evidence on European Branch Banking

This paper examines the role of cost efficiencies on efficient management of branch networks in the contemporary European commercial banking industry. The analysis, which could be generalised to other industries, indicates that larger banks are more likely to have heavily utilised branch networks than smaller banks and to exhibit fewer cost efficiencies from building more branches. The finding of this result within each country suggests the role of internal firm size regardless of competitive conditions. The similar cross‐country finding suggests the impact of factors such as market structure/concentration levels and type of non‐price competition. Larger banks can generate less income per unit asset deployed. Cross‐border efficiency might be improved by greater use of banks with under‐used networks by banks with over‐used networks.     

我国商业银行业务多元化、经营绩效与风险相关性研究

本文引入Herfindahl指数衡量银行业务结构多元化程度,通过建立多元化绩效、多元化风险以及风险—绩效模型,运用2000-2010年间我国19家主要商业银行的面板数据,对商业银行收入结构多元化、经营绩效以及风险的关系进行了系统的分析。研究发现,多元化有效降低了银行的风险,但是其对绩效影响并不明显,银行绩效的改善主要还是来自近年的产权改革、引进外资等治理机制上的变化,以及银行资产规模扩张带来的规模经济效应。这一结论对于我国银行业的进一步改革具有重要的借鉴意义。