基于投资者异质性信念的证券定价模型——对我国股票市场价格的实证检验

投资者异质性信念的相互作用影响着证券价格,证券市场上的各种证券需求与供给关系,往往表现为投资者各种不同信念的对抗和交融。本文以悲观信念（看多）和乐观信念（看空）之间的相互作用为例,研究了异质性信念对资产均衡定价的影响,并以我国股票市场的机构投资者信念为对象进行了实证检验,得出我国股票市场投资者信念与证券价格相互作用的结论。本文的建议是在投资过程中,准确分析市场中投资者的异质性信念结构,尤其是资金雄厚的机构投资者的信念结构至关重要。     

Public policies as specification errors

Treating public policies as computable dynamic general equilibrium model specification errors offers computational and conceptional advantages for comparing models with data. The set of policies calculated to rationalize observed behaviors raises the substantive economic question whether, in any particular market, actual public policies sufficiently coincide with the model's behavior-rationalizing policies, or whether the model offers correct hypotheses about the determinants of demand and supply. As illustrations, public policies are calculated to rationalize, with respect to the stochastic neoclassical growth model, capital market behavior since WWII and labor market behavior in 1929–1950. One conclusion is that capital taxation drives a wedge between consumption growth and the expected pre-tax capital return, in the direction and amount predicted by the theory, and that capital taxation is the major intertemporal distortion in the postwar capital market. Second, a good theory of the Great Depression labor market must explain why measured MRS and MPL diverged so dramatically in 1929–1933 and why the wedge persisted.     

Debreu’s social equilibrium theorem with asymmetric information and a continuum of agents

We provide several different generalizations of Debreu’s social equilibrium theorem by allowing for asymmetric information and a continuum of agents. The results not only extend the ones in Kim and Yannelis (J Econ Theory 77:330–353, 1977), Yannelis and Rustichini (Stud Econ Theory 2:23–48, 1991), but also new theorems are obtained which allow for a convexifying effect on aggregation (non-concavity assumption on the utility functions) and non-convex strategy sets (pure strategies). This is achieved by imposing the assumption of “many more agents than strategies” (Rustichini and Yannelis in Stud Econ Theory 1:249–265, 1991; Tourky and Yannelis in J Econ Theory 101:189–221, 2001; Podczeck in Econ Theory 22:699–725, 2003). To the memory of Gerard Debreu. A preliminary draft was presented in Paris, in April of 2005. I have benefited from the discussion, comments and questions of Erik Balder, Jean-Marc Bonnisseu, Bernard Cornet and Filipe Martins Da-Rocha and Conny Podczeck. A careful and knowledgeable referee made several useful comments and rescued me from a mishap.     

竞争力平价与人民币均衡汇率研究

传统的汇率决定理论认为，一国货币汇率的衡水平是由购买力平价、利率平价和货币相对供求等决定的。大多数实证研究表明，这些均衡汇率理论只是强调单一因素，同现实相距甚远。本文构建了多因素国际竞争力平价模型，认为均衡实际汇率随着国际竞争力的相对变化而变化，国际竞争力相对提高，该国货币升值，反之则反之。本文利用主成分分析法，从影响人民币汇率的多因素中构造国际竞争力这个指标，实证研究表明人民币实际有效汇率与国际竞争力之间存在协整关系，然后再基于这个协整关系式计算人民币的均衡实际有效汇率，并据以判断人民币汇率偏离均衡水平的程度。     

Probability of survival in a random exchange economy with dependent agents

Summary. In this paper I analyze the general equilibrium in a random Walrasian economy. Dependence among agents is introduced in the form of dependency neighborhoods. Under the uncertainty, an agent may fail to survive due to a meager endowment in a particular state (direct effect), as well as due to unfavorable equilibrium price system at which the value of the endowment falls short of the minimum needed for survival (indirect terms-of-trade effect). To illustrate the main result I compute the stochastic limit of equilibrium price and probability of survival of an agent in a large Cobb-Douglas economy. Received June 7, 2001; revised version: January 7, 2002 RID="*" ID="*" I would like to thank Mukul Majumdar and Thomas DiCiccio for helpful discussion and an anonymous referee for valuable comments and suggestions.     

Lost in intervention. The Harrod–Balassa–Samuelson effect on the peseta/dollar real exchange rate (1870–1998)

We have decomposed the peseta/dollar real exchange rate (1870–1998) into its trend and cyclical components and used the former to proxy its time-varying equilibrium. Then, we have compared changes in the equilibrium with changes in the Spanish and the USA productivity differentials to identify years that do not fit with the Harrod–Balassa–Samuelson (HBS) hypothesis. The greatest maladjustment is found in the 1940s and 1950s, decades of strong exchange rate intervention in Spain. Conversely, the link between equilibrium and differentials adjusts to the hypothesis when using the non-intervened peseta/dollar exchange rate on the Tangier black market. These contrasting results back up the idea that exchange rate intervention, so common in developing countries, might explain their scanter evidence in favour of the HBS effect.     

基于博弈理念构建和谐税收制度的基本思路

本文阐述了和谐税收制度对建设和谐社会的重要性,指出和谐的税收制度应是一种纳什均衡的制度.运用博弈理念,从税种结构博弈均衡、税收负担博弈均衡、税收征管博弈均衡及稽查监督博弈均衡四个方面给出构建和谐税收制度的基本思路.     

以银行经营转型促进经济均衡发展

近年来我国经济一直是在一种不均衡的状态下实现快速发展的。以间接融资为主的融资方式，对银行本身乃至整个经济的可持续发展构成潜在威胁。为此，通过银行经营转型，优化储蓄向投资的转化路径，推动储蓄向消费的积极转化，是实现经济均衡发展的重要举措，同时也是银行体系本身可持续发展的需要。     

2005年以来的人民币汇率制度改革：成效、问题和对策

2005年以来,人民币汇率制度改革取得一定的成效,人民币汇率已经趋近于均衡汇率,汇率市场化明显提高,国际收支失衡有所缓解.但是在金融危机的影响之下,最近人民币汇率的波动幅度明显下降,又呈现出固定钉住制度的特征,而且我国货币政策的独立性依旧受到制约,过度依赖外需的经济增长模式还没有转变.进一步推进人民币汇率制度改革,必须扩大汇率弹性,灵活调整货币篮子,深化产权改革,进一步完善外汇市场,稳步推进资本账户开放.     

河北省宏观经济运行的长期均衡分析

运用协整理论和误差修正模型，估计了河北省宏观经济运行的长期均衡和短期波动关系。从长期看，河北省宏观经济系统存在协整关系，且这种关系对即期GDP具有促进作用．河北经济是投资驱动和出口拉动型的，消费不直接促进经济增长，而是通过协整关系间接促进经济增长。