How Do Investors' Expectations Drive Asset Prices?

Based on an extension of the process of investors' expectations to stochastic volatility we derive asset price processes in a general continuous time pricing kernel framework. Our analysis suggests that stochastic volatility of asset price processes results from the fact that investors do not know the risk of an asset and therefore the volatility of the process of their expectations is stochastic, too. Furthermore, our model is consistent with empirical studies reporting negative correlation between asset prices and their volatility as well as significant variations in the Sharpe ratio.     

An Examination of Alternative Factor Models in UK Stock Returns

This paper examines the mean-variance efficiency of a number offactor models in UK stock returns. The paper also explores, using theapproach of MacKinlay (1995), whether missing risk factors ornonrisk-based explanations best explain the pricing errors of thedifferent factor models. The evidence in the paper suggests that themean-variance efficiency of each factor model is rejected and missing riskfactors are unable to explain the pricing errors of any of the models.Some nonrisk-based explanations, which posit a wide spread in abnormalreturns, may be a more plausible source of explaining the pricing errorsof the factor models.     

Housing-Price Cycles and Prepayment Rates of U.S. Mortgage Pools

Empirical mortgage prepayment models generally have trouble explaining differences in mortgage-prepayment speeds among pools with similar interest rates on the underlying mortgages. In this article, we model some of the sources of termination heterogeneity across mortgage pools, particularly the role of regional variations in housing prices in generating atypical prepayment speeds. Using a sample of Freddie Mac mortgage pools from 1991 to 1998, we compare two classes of empirical models: a rational option-pricing model using a backward-solving pricing algorithm and an empirical hazard model. In both empirical estimation strategies, we find evidence that differences in house-price dynamics across regions are an important source of between-pool heterogeneity. This finding is then shown to be robust to alternative ways of parameterizing pool heterogeneity in mortgage termination models.     

Taxpayer resistance,guarantee uncertainty,and housing finance subsidies

In the absence of external guarantees, a private firm's debt trades in the market at rates reflective of its private default risk. Not all firms go it alone, however. There are entities, government-sponsored enterprises (GSEs), whose debt obligations enjoy federal guarantees. Federal guarantees affect housing finance indirectly in that they tend to enhance the creditworthiness of the debt obligations of the housing intermediary which lessens the debtholder's exposure to default. The market investor then becomes a willing buyer of GSE debt at a lower (subsidized) rate as a result of the government guarantee.Due to the fact that the subsidy rests on the presumption that the GSE debt will be bailed out by the government it can be seen that the subsidy in turn rests upon the presumption by the GSE debtholder that the taxpayers will honor the guarantee in the event of a GSE default. Hence, government subsidies to the housing intermediaries rest not on ongoing government outlays but rather on the confidence that the taxpayers will be willing, if called upon, to cover GSE losses, i.e., the confidence of a bailout.This article analyzes the effects on the GSE subsidy and on the taxpayer, if the debt markets charge for bailout risk. Bailout risk pricing is an economic event. When debtholders seek to protect themselves by pricing for bailout risk, this increases GSE borrowing costs and cuts into both GSE borrowers' subsidies and stockholder earnings. Higher borrowing costs leave the GSE in a weakened condition and increase the ex ante bailout cost to the taxpayer. When bailout risk premiums become priced by the market, it substantially lessens the government's ability to subsidize housing finance or other GSE activities.     

常用预测方法的模糊综合评判模型

本文对预测中的评价问题进行了系统的研究。在此基础上,建立了一个常用预测方法的模糊综合评判模型,为预测者评价和选择预测方法提供依据。     

Parametric,semiparametric, and nonparametric estimation of characteristic values within mass assessment and hedonic pricing models

Parametric estimators, such as OLS, attain high efficiency for well-specified models. Nonparametric estimators greatly reduce specification error but at the cost of efficiency. Semiparametric estimators compromise between these dual goals of efficiency and specification error. Semiparametric estimators can assume general forms within classes of functional forms. This paper applies OLS, the kernel nonparametric regression estimator, and the semi-parametric estimator of Powell, Stock, and Stoker (1989) to a data set, which should, based on theory and previous empirical work, yield positive coefficients. The semiparametric estimator, on average, displayed the performance most consistent with prior expectations followed by the nonparametric and parametric estimators. In addition, the paper shows how the semiparametric estimator can provide insights into the form of misspecification and suggest data transformations.     

A trivariate model of participation,fertility and wages: the Italian case

Italy has unusually low fertility by OECD standards, accompaniedby unusually low female participation in paid work. This paperaddresses the issue of the empirical relationship between fertility,female participation in the labour market and wages with theseItalian 'peculiarities' as a backcloth. A trivariate model ofparticipation, fertility and wages has been constructed andestimated using three pooled cross-sections of Italian microdata, allowing for the identification of cohort effects. Thismodel follows a 'purist' approach: the participation and fertilitydecisions, as well as the wage equation, are modelled as completelyjoint. The cohort effects turn out to be significant: the pointestimates do not appear to confirm actual trends, which arenegative for fertility and positive for participation. The femalewage is the most important variable influencing the propensityto have children and the propensity to participate in the labourmarket, casting doubt on suggestions that observed trends arethe products of shifts in women's 'tastes'.     

Employment Growth Determinants in New Firms in Eastern Germany

The unification of both Germanies and the introduction of the market economy in eastern Germany came as a shock to existing firms and led to an enormous boom in the establishment of new firms. The first section of this paper shows that during the period under observation (January 1991--June 1995) the number of firms nearly doubled and in 1995, nearly 50% of all jobs were to be found in firms established after 1991. Shortly after unification, a kind of "start- window" existed during which the conditions for establishment, growth and survival of firms were extraordinarily good. The next section deals with the determinates of the growth of these newly founded firms. Most determinants have been selected on the basis of the most recent studies by Brüderl, Preisendörfer and Ziegler (1996), and Storey (1994). The analysis included not only establishment characteristics but also strategic factors such as the technological status of the establishment, the proportion of sales in interregional markets, and a corporate competitive strategy indicator. A comparison of these results with other studies shows that the determinants that affect employment growth in new firms in eastern German are apparently the same as in western Germany and Britain, albeit to different extents.