资本监管、银行信贷与货币政策非对称效应

本文通过对在单一约束的商业银行利润函数中植入监管当局惩罚函数的静态理论模型的分析得出:监管当局以提高资本充足率为核心的监管行为不仅有效地影响了商业银行的信贷行为和风险意识,而且强化了"逆风向行事"的货币政策的非对称效应,接着本文对我国1998年以来经历的两次经济波动进行了实证分析,其结论是:1998年以来,监管当局对商业银行以降低坏账率、提高资本充足率为核心的监管行为强化了我国货币政策非对称效应。     

Capital Inflows,Exchange Rate Flexibility and Credit Booms

Historically, capital flow bonanzas have often fueled sharp credit expansions in advanced and emerging market economies alike. Focusing primarily on emerging markets, this paper analyzes the impact of exchange rate flexibility on credit markets during periods of large capital inflows. It is shown that bank credit is larger and its composition tilts to foreign currency in economies with less flexible exchange rate regimes, and that these results are not explained entirely by the fact that the latter attract more capital inflows than economies with more flexible regimes. The findings thus suggest countries with less flexible exchange rate regimes may stand to benefit the most from regulatory policies that reduce banks' incentives to tap external markets and to lend/borrow in foreign currency; these policies include marginal reserve requirements on foreign lending, currency‐dependent liquidity requirements and higher capital requirement and/or dynamic provisioning on foreign exchange loans.     

Capital controls and welfare with cross-border bank capital flows

This performance of time-varying capital controls on cross-border bank borrowing is studied in an open-economy, dynamic stochastic general equilibrium model with financial frictions and imperfect capital mobility. The model is parameterized for a middle-income country and replicates the stylized facts associated with a drop in world interest rates—capital inflows, real appreciation, credit boom, asset price pressures, and output expansion. A capital controls rule, which is fundamentally macroprudential in nature, is defined in terms of changes in bank foreign borrowing. The welfare-maximizing rule is established numerically and compared to the Ramsey policy. The analysis is then extended to solve jointly for optimal countercyclical reserve requirements and capital controls rules. The results show that the implementation of a countercyclical credit-based reserve requirement rule induces less reliance on capital controls. Thus, these two instruments are partial substitutes in maximizing welfare.     

The Macroeconomic Implications of Regulatory Capital Adequacy Requirements for Korean Banks

The capital adequacy requirement, combined with the flight to quality, contributed to a drastic credit slowdown and a sharp recession in Korea in the aftermath of the financial crisis. Since most banks were placed under the strengthened capital adequacy constraints, they reduced loans to firms with high credit risks. As a result, bank-dependent small and medium-sized enterprises (SMEs) were badly hit, and eventually demand for bank loans fell. The reduction in loans was most visible among banks with poor capital adequacy, yet the overall change in bank portfolios had a disproportionately large negative influence on financial conditions for SMEs. In conclusion, the banks' response to capital adequacy requirements resulted in changes in the loan/bond ratio which, in turn, reduced loans to SMEs and caused a sharp cut in production. The resulting contraction in SME production created a polarized industrial structure and a chronic depression in the traditional sectors of the economy. The introduction of capital adequacy requirements (CARs) in the wake of financial crisis worsened conditions for SMEs and weakened the validity of the CARs that were mainly necessitated by successive failures among larger firms.     

The Impact of Monetary Policy and Housing-Purchase Restrictions on Housing Prices in China

This paper examines the level and volatility effect of monetary policy on housing prices in China utilizing a novel set of housing price indices constructed by (Fang, H., QuanlinGu, W. X., & Zhou, L.-A. (2015). Demystifying the Chinese housing boom. NBER Macroeconomics Annual 2015, Volume 30. University of Chicago Press.). We find that in the long-run, average housing prices react positively to inflation, money supply and bank lending growth, and negatively to the reserve requirement ratio and benchmark lending rate. Housing prices in Tier 1 cities respond more sensitively to monetary shocks relative to Tier 2 and 3 cities, possibly due to surging demand and limited supply under housing-purchase restrictions (HPR). We further study the volatility effect of monetary shocks using the GARCH model and find that the benchmark lending rate, reserve requirement ratio and money supply growth have strong negative impact on the volatility of housing price growth. Our benchmark results remain robust after incorporating the HPR policy variable in the estimation, with a significant negative effect of HPR on housing price growth in Tier 1 and Tier 2 cities. Lastly, we conclude with recommendations on future monetary policy design and implementation, with a specific focus on the heterogeneous characteristics of China’s housing market.     

Scarce collateral and bank reserves

If collateral for bank loans is scarce and, if as a result, access to secured loans is restricted, the allocation of resources is inefficient. In anticipation of future borrowing constraints, individuals over-invest in collateralized types of capital, and consume and invest inefficiently low levels while they are borrowing constrained. The dual counterpart of this misallocation of resources is inefficiently low interest rates. In this situation, bank reserves play a positive welfare role by adding liquidity to the economy and by increasing not only bank lending rates, but also, paradoxically, bank deposit rates. As a result, in economies with scarce collateral the optimal reserves–requirement ratio is positive.     

Basel II procyclicality: The case of South Africa

This paper studies the impact of bank capital regulation on business cycle fluctuations. In particular, we study the procyclical nature of Basel II claimed in the literature. To do so, we adopt the Bernanke et al. (1999) “financial accelerator” model (BGG), to which we augment a banking sector. We first study the impact of a negative shock to entrepreneurs' net worth and a positive monetary policy shock on business cycle fluctuations. We then look at the impact of a negative net worth shock on business cycle fluctuations when the minimum capital requirement increases from 8 percent to 12 percent. Our comparison studies between the augmented BGG model with Basel I bank regulation and the one with Basel II bank regulation suggest that, in the presence of credit market frictions and bank capital regulation, the liquidity premium effect further amplifies the financial accelerator effect through the external finance premium channel, which, in turn, contributes to the amplification of Basel II procyclicality. Moreover, under Basel II bank regulation, in response to a negative net worth shock, the liquidity premium and the external finance premium rise much more if the minimum bank capital requirement increases, which, in turn, amplify the response of real variables. Finally, small adjustments in monetary policy can result in stronger response in the real economy, in the presence of Basel II bank regulation in particular, which is undesirable.     

Reserve requirements as a macroprudential instrument – Empirical evidence from Brazil

Emerging market central banks are often reluctant to raise interest rates when facing credit booms driven by capital inflows, and they instead use reserve requirements as an additional instrument. We compare the macroeconomic effects of interest rate and reserve requirement shocks by estimating a structural vector autoregressive model for Brazil. For both instruments, discretionary tightening results in a credit decline. Contrary to an interest rate shock, however, a positive reserve requirement shock leads to an exchange rate depreciation, a current account improvement, and an increase in prices. The different effects highlight the role of reserve requirement policy as a complement to rather than a substitute for interest rate policy. The results support the bank lending channel as the main transmission mechanism for reserve requirement policy.     

Optimal bank interest margins under capital regulation in a call-option utility framework

This paper examines the optimal bank interest margin under capital regulation when the bank's preference admits an additive call-option representation including both the like of higher equity return and the dislike of higher equity risk. In the call-option utility maximization, an increase in the capital requirement results in an increased amount of loans held by a bank at a reduced margin when loan quality is in distress. We also show that the impact on the bank interest margin from an increase in the capital requirement which ignores the dislike, that we call such behavior call-option equity maximization, leads to significant underestimation. Our results cast doubt on the effectiveness of capital regulation to exert a risk-reducing and return-increasing effect on the bank in particular where loan quality becomes worse, thereby adversely affecting the stability of the banking system.     

Assessing the effectiveness of monetary policy in Kenya: Evidence from a macroeconomic model

This paper examines the effectiveness of monetary policy in Kenya based on policy simulations from a structural macroeconometric model. The analysis is conducted using the policy rate, i.e. the central bank rate (CBR) and the cash reserve ratio (CRR) with respect to the interest rate and bank lending channels, respectively. The results indicate that whereas a change in the policy rate is effective in influencing short term rates, the long term lending rates respond marginally. Consequently, the transmission to the real economy and the overall impact on inflation is minimal. However, a change in CBR has a comparatively higher impact on inflation while a change in CRR has a relatively larger impact on aggregate demand. Enhancing the effectiveness of the CBR and strengthening of the interest rate channel have the potential of anchoring inflation expectations and boosting the effectiveness of monetary policy in Kenya.     

信贷风险、监管约束与银行最优行为

本文在观察到中国银行业信贷膨胀背景下几个典型事实后,基于国内外巴塞尔协议与银行行为的研究成果,通过在C-C模型的基础上植入信贷风险和存贷比约束进行了两个方面的拓展。在这个新的理论框架下,我们不仅分析了资本松约束和资本紧约束下银行的最优行为,同时也研究了银行资本的决定因素。我们发现,外部融资成本的增加、惩罚力度的加大、存贷比要求的提高、贷款边际成本的上升以及垄断势力的强化,都将使得银行资本量趋于下降,但各个变量具体的作用机制存在很大不同。更重要的是,逆周期性的信贷损失和凸形的惩罚函数具有双重强化银行资本顺周期性特征,法定最低资本充足要求的提高,只有在满足特定条件下,才可能带来银行实际资本的增加。通过对银行信贷膨胀机理的深入解析,本文为有关政策抉择提供了某种理论依据。     

论国际资本流动的货币冲击效应

在我国现行的有管理浮动汇率制度下，国际资本流动通过储备资产的变动、资本外逃等途径对中央银行基础货币投放量发生冲击，这种冲击影响着货币政策的有效性，为增强中央银行对货币供应量的控制能力，应该从操作资产、操作目标、操作手段三个方面改善公开市场业务，提高冲销操作的有效性。     

Involuntary excess reserves,the reserve requirements and credit rationing in China

Using a sample of 95 banks that covers the period 2000–2011, this article examines Chinese banks’ credit lending behaviour in response to the changes in the reserve requirement ratio in the presence of involuntary excess reserves (IERs) in the banking system. The study finds that Chinese banks with positive IERs one period after a reserve requirement shock experience a significantly increased credit supply in response to an increase in reserve requirement ratio. However, the reserve requirements have no significant impact on the credit supply in Chinese banks that have negative IERs one period after a reserve requirement shock. This article sheds lights on the effectiveness of Chinese monetary policy, which uses reserve requirements as the primary tool to sterilize excess liquidity and restrain credit expansion.     

人民币汇率、国际资本流动与货币政策有效性研究*——基于修正BGT模型的实证分析

本文采用修正的BGT模型,实证研究了国际资本流动影响因素以及央行在面对国内外资本市场波动、金融体系变迁等情形下,货币政策实施方式及其效果。结果显示,随着意愿结售汇制度的实行和人民币汇率弹性的增强,央行的货币自主性得以加强;在开放环境下,国际资本流动受国内外利差、资本市场溢价、货币政策及汇率制度和外汇管理制度的影响。面对这些国内外冲击,央行进行了央票冲销或调整准备金率等的反向货币政策操作,以实现货币政策目标。     

Does bank shareholding impact corporate innovation? Evidence from China

Corporate innovation is an engine of economic development, while bank shareholding is the phenomenon of having a bank as a shareholder. Their relationship, however, has been underexamined. We provide the first study on the direct impact of bank shareholding on corporate innovation. Using patents granted to Chinese firms from 1999 to 2013, our findings suggest that bank shareholding significantly contributes to corporate innovation. Additional analysis suggests that easing financial constraints can facilitate the positive impacts of bank shareholding on corporate innovation. We also find that bank shareholding works better when firms have effective external monitoring and when they are nonstate-owned firms with nonstate-owned banks as shareholders. We contribute to the literature by showing that (1) despite the restrictions some countries impose on bank shareholding, allowing it could be a good economic policy for promoting corporate innovation, and (2) successful corporate innovation requires proper monitoring and incentives.     

Are microfinance institutions resilient to economic slowdown? Evidence from their capital ratio adjustment over the business cycle

Prior studies using pre-crisis data concluded that microfinance institutions are resilient to economic crises. However, some recent studies indicate that the microfinance sector is becoming part of the global financial system and microfinance lending activities are now vulnerable to economic and financial crises. Capital being a key resource to support lending, this paper analyzes the cyclical behaviour of capital ratio using an international sample of microfinance institutions from 2001 to 2014. We uncover a negative relationship between their capital-to-assets ratios and business cycle indicators. This relationship mainly concerns regulated institutions, comprised mostly of profit-oriented MFIs, and is driven by both asset-side and capital level adjustments. We identify the lending channel (loan-to-assets ratio) as the main mechanism to explain these cyclical variations. Our findings are consistent with the “procyclicality” of capital regulation documented extensively in the banking literature. Hence, macro-prudential regulation for MFIs should target regulated and profit-oriented MFIs.     

BANK CAPITAL FORBEARANCE AND PUBLIC POLICY

Recently, the bank regulatory agencies have adopted capital forbearance programs to permit some troubled agriculture and energy banks to operate temporarily with capital levels below the regulatory minimum requirement. In a world with federal deposit insurance and a lender of last resort, bank capital is no longer viewed by all depositors as the primary protector of their funds. Thus, they reduce their market discipline. Bank owners/ managers are likely to respond by increasing their risk exposure in an attempt to regain profitability. If they win, they keep all the gains; if they lose, the losses are passed on to the Federal Deposit Insurance Corporation (FDIC). A preferred policy is to require these banks to raise additional capital at this time or to be sold. Capital forbearance is forbearance of incumbent bank management/owners, not of bank customers.     

银行信任视角下我国小微企业的信贷约束研究*——基于问卷调查的实证分析

信贷关系中的信任可以减少代理行为和机会主义行为倾向，对缓解小微企业信贷约束有重要启示。本文通过调查问卷获取样本，基于银行信任的研究视角，借助广义结构方程模型从三个维度(信贷可获得性、贷款利率和抵押要求)实证检验银行信任对小微企业信贷约束的影响。结果显示，银行对小微企业较高程度的能力信任和诚实信任有助于提升小微企业的信贷可获得性，但对贷款利率及抵押要求无显著影响。本文为小微企业信贷约束研究提供了一个全新的视角。     

On the Feasibility of Risk Based Regulation

Risk based regulation has emerged as the primary ingredientin the Basel-II proposals, where a bank capital is to becomea direct function of a bank's riskiness. While the notion thatbank capital be risk sensitive is intuitively appealing, theactual implementation, in the form of Basel-II, carries withit a host of potentially perverse side effects. Basel-II mayincrease financial risk, both for individual institutions andthe entire banking system, and hence promote financial instability.This can happen, e.g., due to the endogenous nature of risk(JEL G2)     

Effectiveness of the reserve option mechanism as a macroeconomic prudential tool: evidence from Turkey

This article assesses the effectiveness of a novel macroprudential tool – the reserve option mechanism (ROM) – which Turkey’s central bank developed during the post-2008 period and has employed to control the risk associated with excessive capital flows. We assess how capital flows have affected economic variable changes since the introduction and usage of the ROM. Empirical evidence gathered from Turkey suggests that the tool decreases the effect of capital flow on capital flow (positive shock to capital flow dies out faster or becomes less persistent) and diminishes the effects of capital flow shocks on exchange and interest rates.