信贷量经济效应的期限结构研究

银行信贷和经济波动的关系一直是理论和实务界关注的焦点,过去国内的研究大多仅从信贷总量层面入手而忽视了结构效应,这不利于厘清信贷在经济中的作用机理。在将贷款按期限划分为短期贷款和中长期贷款后,本文通过应用一个小型DSGE模型,发现短期贷款对经济增长虽有短期的促进作用,但却形成通货膨胀压力;而中长期贷款对经济增长有长期的促进作用,同时对通货膨胀有一定的抑制作用。以我国1998-2010年的宏观数据为样本进行的FAVAR检验支持了上述观点。该结论一方面意味着信贷政策及其监管应加强对信贷期限结构的关注,另一方面结合我国近年来中长期贷款比重大幅上升的客观事实,也从一个新的视角解释了货币信贷加速扩张的同时,价格水平却较为稳定的"中国货币之谜"。     

我国利率期限结构的静态分析和动态特征

利率期限结构反映的是利率和到期期限之间的关系。文章利用指数样条法估计出我国上交所国债的利率期限结构，对其进行静态的分析，得到上交所国债利率期限结构统计特征。同时，应用主成分分析方法研究国债利率期限结构的动态特征，发现水平因素、斜度因素和凸度因素对我国国债即期利率曲线变动的解释能力分别达到51．28％、26．63％和10．86％，累计贡献率达到88．77％，不同因素对各个到期期限即期利率的影响程度也有所不同。     

Interest rate trees: extensions and applications

This paper provides extensions to existing procedures for representing one-factor no-arbitrage models of the short rate in the form of a tree. It allows a wide range of drift functions for the short rate to be used in conjunction with a wide range of volatility assumptions. It shows that, if the market price of risk is a function only of the short rate and time, a single tree with two sets of probabilities on branches can be used to represent rate moves in both the real-world and risk-neutral world. Examples are given to illustrate how the extensions can provide modelling flexibility when interest rates are negative.     

基于参数空间的ST-ECM模型的协整检验问题研究

在非线性平滑转移误差修正模型（ST-ECM）的协整检验中,由于存在未识别参数而使协整检验统计量构造困难,同时由于目前文献普遍使用的泰勒展开近似法并不能精确替代原始非线性模型,从而导致协整检验统计量功效较低。本文首先在遍历未识别参数的参数空间的基础上构造了ST-ECM模型协整检验的supF统计量,推导了supF统计量的极限分布并说明了其收敛性质。接着,蒙特卡洛仿真模拟结果显示,supF统计量在ST-ECM模型协整检验中具有良好的检验水平和功效,且supF统计量的功效明显优于EG统计量、F*NEC统计量和inft统计量。最后,本文对亚洲六个国家的利率期限结构预期假说进行了验证,结果表明中国、新加坡和泰国三个国家的利率期限结构预期假说成立且存在非线性调整效应,supF统计量较其他统计量具有更高的检验功效。     

Monetary policy,bond risk premia,and the economy

Within an affine model of the term structure of interest rates, where bond yields get driven by observable and unobservable macroeconomic factors, parameter restrictions help identify the effects of monetary policy and other structural disturbances on output, inflation, and interest rates and decompose movements in long-term rates into terms attributable to changing expected future short rates versus risk premia. When estimated, the model highlights a broad range of channels through which monetary policy affects risk premia and the economy, risk premia affect monetary policy and the economy, and the economy affects monetary policy and risk premia.     

Determinants of bank interest margins: Impact of maturity transformation

This paper explores the extent to which interest risk exposure is priced into bank margins. Our contribution to the literature is twofold: First, we extend the Ho and Saunders (1981) model to capture interest rate risk and expected returns from maturity transformation. Banks price interest risk according to their individual exposure separately in loan and deposit intermediation fees, but reduce (increase) these charges for loans (deposits) when positive excess holding period returns from long-term exposures are expected. Second, we test the model-derived hypotheses not only for the commonly investigated net interest margin but also for interest income and expense margins separately in a sample encompassing the German universal banking sector between 2000 and 2009. Our results suggest that banks price their individual interest rate risk and corresponding expected excess holding period returns via the asset side into the net interest margin. For liabilities, we find that interest rate risk exposure is only priced in by smaller, local banks.     

对发展我国长期护理保险的相关思考

我国商业保险公司虽已推出了长期护理保险，但尚处于起步阶段。文章认为我国应借鉴国外先进经验，尽快建立长期护理保险体系，达到增进老年人福利以及促进经济社会和谐发展的目标。     

The implied volatility smirk

This paper provides an industry standard on how to quantify the shape of the implied volatility smirk in the equity index options market. Our local expansion method uses a second-order polynomial to describe the implied volatility–moneyness function and relates the coefficients of the polynomial to the properties of the implied risk-neutral distribution of the equity index return. We present a formal, two-way representation of the link between the level, slope and curvature of the implied volatility smirk and the risk-neutral standard deviation, skewness and excess kurtosis. We then propose a new semi-analytical method to calibrate option-pricing models based on the quantified implied volatility smirk, and investigate the applicability of two option-pricing models.     

Well-posedness and invariant measures for HJM models with deterministic volatility and Lévy noise

We give sufficient conditions for the existence, uniqueness and ergodicity of invariant measures for Musiela's stochastic partial differential equation with deterministic volatility and a Hilbert space valued driving Lévy noise. Conditions for the absence of arbitrage and for the existence of mild solutions are also discussed.     

Bond risk, bond return volatility, and the term structure of interest rates

This paper explores the time variation in the bond risk, as measured by the covariation of bond returns with stock returns and consumption growth, and in the volatility of bond returns. A robust stylized fact in empirical finance is that the spread between the yields on long- and short-term bonds forecasts future excess returns on bonds at varying horizons positively; in addition, the short-term nominal interest rate forecasts both the stock return volatility and the exchange rate volatility positively. This paper presents evidence that movements in both the short-term nominal interest rate and the yield spread are positively related to changes in the subsequent realized bond risk and bond return volatility. The yield spread appears to proxy for business conditions, while the short rate appears to proxy for inflation and economic uncertainty. A decomposition of bond betas into a real cash flow risk component and a discount rate risk component shows that yield spreads have offsetting effects in each component. A widening yield spread is correlated with a reduced cash-flow (or inflationary) risk for bonds, but it is also correlated with a larger discount rate risk for bonds. The short rate only forecasts the discount rate component of the bond beta.