“一保一控”政策背景下的房地产业发展研究

在未来一段时期,我国经济要实现“一保一控”的宏观调控目标,扩大内需是关键。国际经验表明,每一次的房价大幅度下降,都可能伴随着消费的停滞和经济的衰退。政府的宏观调控,既要有利于避免房价大幅上涨带来泡沫,也要防止房地产市场的过度波动对宏观经济稳定的冲击。因此,防止我国房地产业出现“大落”,应包含在“一保一控”宏调政策的内容之中。     

Determinants of stock market volatility and risk premia

Summary. We show the dynamics of diverse beliefs is the primary propagation mechanism of volatility in asset markets. Hence, we treat the characteristics of the market beliefs as a primary, primitive, explanation of market volatility. We study an economy with stock and riskless bond markets and formulate a financial equilibrium model with diverse and time varying beliefs. Agents states of belief play a key role in the market, requiring an endogenous expansion of the state space. To forecast prices agents must forecast market states of belief which are beliefs of others hence our equilibrium embodies the Keynes Beauty Contest. A market state of belief is a vector which uniquely identifies the distribution of conditional probabilities of agents. Restricting beliefs to satisfy the rationality principle of Rational Belief (see Kurz, 1994, 1997) our economy replicates well the empirical record of the (i) moments of the price/dividend ratio, risky stock return, riskless interest rate and the equity premium; (ii) Sharpe ratio and the correlation between risky returns and consumption growth; (iii) predictability of stock returns and price/dividend ratio as expressed by: (I) Variance Ratio statistic for long lags, (II) autocorrelation of these variables, and (III) mean reversion of the risky returns and the predictive power of the price/dividend ratio. Also, our model explains the presence of stochastic volatility in asset prices and returns. Two properties of beliefs drive market volatility: (i) rationalizable over confidence implying belief densities with fat tails, and (ii) rationalizable asymmetry in frequencies of bull or bear states.This research was supported by a grant of the Smith Richardson Foundation to the Stanford Institute for Economic Policy Research (SIEPR). We thank Kenneth Judd for constant advice which was crucial at several points in the development of this work. We also thank Kenneth Arrow, Min Fan, Michael Magill, Carsten Nielsen, Manuel Santos, Nicholas Yannelis, Ho-Mou Wu and Woody Brock for comments on earlier drafts. The RBE model developed in this paper and the associated programs used to compute it are available to the public on Mordecai Kurzs web page at http://www.stanford.edu/ mordecai.This revised version was published online in January 2005 with corrections to the Cover date.     

基于投入产出模型的中日进出口产品结构合理性比较研究

从进出口部门的角度出发,通过构建进出口产品结构的合理性评价机制和评价指标,运用中日两国的投入产出表,对中日两国进出口产品结构的合理性进行分析和比较。结论如下:中国进出口产品结构的合理性要优于日本进出口产品结构的合理性,中国的进口产品合理度指数高于日本的进口产品合理度指数,而出口产品的合理度指数却低于日本。最后分析了产生这些差距的原因,并得出了重要的政策启示。     

对理性模式的反思

在管理过程中,无论是政策的制定者还是政策的执行者无不都在追求理性地做出行动,希望在"理性"的驱使下确保自己能够正确、科学而有效地实现其活动目标,并因此建立起"理性模式"来指导管理活动。但是,人的理性是有限的,因此,在归纳人类理性行为机制基础上而建立起的"理性模式"也是具有一定的局限的,对这些局限进行充分的认识对于管理活动来说意义不可小觑。     

理性预期与能源投资——基于中国碳减排承诺的自然实验

引入宏观经济学的理性预期分析框架来评估未来碳减排承诺如何影响当期的能源投资行为具有重要意义。能源项目投资规模大、持续时间长、不可逆性强,使得投资者在决策时会尽可能地纳入影响未来收益和成本的信息。本文将中国碳排放权交易市场试点政策与发电行业投资行为相结合,理论分析和实证检验了政府规划和实施的碳排放权交易市场试点政策如何影响企业的理性预期作用于当期发电技术项目投资,结果表明,碳排放权交易市场试点政策在规划期会促使企业相对提高试点地区低排放发电技术项目投资,特别是相对提高了这些地区低排放火力发电技术项目投资。碳排放权交易试点政策正式实施之后,企业降低了政策试点地区的高排放发电技术项目投资的实际利用水平。这一发现说明环境管制政策在正式实施之前的规划期,会对企业的投资行为产生预期管理效应,通过释放减排政策信号,促使企业先验地调整能源投资决策,以适应未来减排承诺目标。     

中国农村消费的刺激机制与理性回归

近几年,我国农业与农村基础设施投资不断增加促进了农业生产率的提高,加速了农村产业的转型。现代农业的逐步实施、农村环境的改善和保障体系的初步建成,使得农村消费增长的内在条件基本成熟。然而,刺激农村消费增长必须建立适合中国特色的理性消费机制,促进农民收入稳定增长,理性回归才能更好地保障农村经济可持续发展。     

Are high–frequency traders informed?

Are high–frequency traders (HFTs) informed? To address this question, we examine HFTs' activity in the call auction environment, where speed-related trading is limited and signal processing capacity becomes more relevant. To model the call market, we consider the Kyle (1989) rational expectations framework for strategic trading. The test we propose for detecting informed HFTs in this market assesses potential deviations of the informativeness of HFTs' aggregate (net) demand, from the informativeness of the aggregate demand submitted by the rest of the traders. Data from the Euronext Paris preopening phase indicate that informed HFTs are present in the market just before the opening. Our results provide useful guidance for the assessment of the influence of HFTs’ quotes on price quality, an important issue for market regulators and policy makers.     

Modelling demand for lotto using a novel method of correcting for endogeneity

Modelling lottery sales as a function of the mean, standard deviation and skewness of the probability distribution of returns potentially gives insights into how the design of a game could be modified to maximise net revenue. But use of OLS is problematic because the level of sales itself affects values of the moments (and insufficient instruments are available for IV regression). We draw on the concept of a rational expectations equilibrium, developing a new regression model which corrects for endogeneity where the causal impact of the dependent variable on the right-hand side variables is deterministic. We apply the model to data on lotto sales from Spain. Using the Spanish data, we show that results provide more reliable guidance to lottery agencies because accounting for endogeneity leads to significantly different results from OLS and these results have superior performance in out-of-sample forecasting of sales. More generally, results prove consistent with the Friedman-Savage explanation of why people buy lottery tickets and with evidence from racetrack data that ‘bettors love skewness’.     

基于方差分解法的中国股市泡沫检验问题研究

基于理性投机泡沫理论,采用方差分解法对2005年5月到2012年9月上证综指是否存在泡沫以及泡沫的严重程度进行实证检验,并将检验结果同动态自回归法得到的结果进行比较。研究发现该方法能更有效地检测出我国股市中存在的严重投机性泡沫。