基于VaR修正理论的投资组合优化模型

根据风险价值VaR的计算思路,本文提出了基于GARCH理论的风险计量投资组合优化模型;同时在修正的VaR——尾条件期望的基础上对证券组合投资的优化模型做了进一步的改进。     

基于数学期望的采购风险管理决策分析

风险决策中的期望值法是处理风险决策问题的常用方法。借助于期望值法,结合某企业的案例数据,对如何实现物流采购的最优化进行风险决策分析,并对最优方案进行了稳定性分析。     

New tips from TIPS: Identifying inflation expectations and the risk premia of break-even inflation

This paper decomposes the break-even inflation rates derived from inflation-indexed bonds into inflation risk premia, liquidity risk premia, and inflation expectations. I estimate a common factor model with autoregressive conditionally heteroscedastic (ARCH) errors that extracts co-movements from twenty-two monthly and quarterly indicators to identify these three components. The results indicate that the sharp declines in the 10-year and 5-year break-even inflation rates in 2009 reflect a substantial increase in liquidity risk rather than a decrease in inflation expectations. Break-even inflation rates underestimate inflation expectations over nearly the entire sample due to the liquidity risk premia carried by the inflation indexed bond yields. Also, the model-implied inflation expectations show better forecast performance for the average annual inflation rates than raw break-even inflation rates, the Survey of Professional Forecasters, and the Surveys of Consumers inflation forecasts.     

预期违约制度探微

长期以来，我国一直没有确立系统的预期违约制度，导致实践中普遍存在的预期违约行为缺乏相应的法律规则；直到1999年《中华人民共和国合同法》颁布实施后，这一局面方得以改变。本文从预期违约行为的含义入手，具体分析了我国确立预期违约制度的必要性以及现行合同法上预期违约制度的主要内容。     

The Value of the Rent Control Option

In this paper, we combine direct arbitrage arguments and an option-pricing approach to develop a method of pricing the option for rent control. For a lump-sum payment of key money, a tenant acquires the right to rent a real estate unit for an exogenously determined controlled rent, as opposed to paying the free-market rent. The tenant may continue exercising this right as long as he or she lives. Alternatively, the tenant may sell the right to occupy the controlled rent unit and receive a fraction of the key money paid by the subsequent tenant. We value the equilibrium key money, in a representative agents partial equilibrium, while endogenously determining the expected tenure duration in a controlled rent unit. We propose a procedure for valuing rent control options different from the representative agents. Our analysis shows that under real-world levels of conditional life expectancy, the level of the fraction of the key money retained by a departing tenant has an insignificant effect on the expected tenure duration in a controlled rent unit and on the level of key money.     

基于理性预期条件下的宏观经济政策有效性分析

理性预期理论是最近二十几年在西方发展起来的一个新兴学派,它的发展在一定程度上改变了现代西方经济学的分析方法和理论结构。本文从理性预期学派的起源和理论基础出发,以理性预期的视角探讨现代宏观经济体系中微观层面上个体行为与宏观层面上经济行为之间的内在联系,认为政府在微观经济主体具备良好理性预期能力的前提下,宏观经济政策对经济的调节是有限的,政府必须充分尊重并合理引导微观经济主体的预期,才能不断提高宏观经济政策的效用。     

Convergence since the Second World War: Blind Alleys and Misplaced Expectations

Abstract

The gap in income between the richest and the poorest countries is very large and increasing. But as we probe deeper the picture becomes less clear regarding the facts and more so the conceptual basis of the analysis. The growing gap hides substantial progress in most welfare indicators for most of the world's population. The theory beyond the expectations of convergence seems inadequate, especially for the case of Sub-Saharan Africa.     

投资者异质性与证券市场定价——理论模型与中国的经验证据

本文从投资者异质性的客观现实出发,通过对投资者二维视角的交叉分类与相关行为的探讨,提出了一种按交易特点与行为依据的新的分类方案,即将投资者分为套利交易者、价格预期交易者和量能变动交易者三类。在此基础上分别建立了各类投资者的需求函数,通过对证券市场供求函数的讨论,利用均衡分析方法构建了基于投资者异质性的证券市场定价模型,并以我国证券市场1999-2011年的月度数据为样本进行了实证分析。实证结果表明:我国证券市场价格主要由价格预期交易者的诱导性策略行为与量能变动交易者的羊群行为决定,套利交易者的套利行为对市场价格没有显著的影响,证券市场扩容也未对市场价格的形成产生系统性冲击。     

Generalized densities of order statistics

Let X ₁, ... , X _n be independent identically distributed random variables with distribution F . We derive expressions for generalized joint 'densities' of order statistics of X ₁, ... , X _n , for arbitrary distributions F , in terms of Radon–Nikodym derivatives with respect to product measures based on F . We then give formulae for conditional distributions of order statistics and use them to derive results concerning Markov properties of order statistics, formulae for distributions of trimmed sums, and other useful representations. Our approach leads to simple and natural expressions which appear not to have been given before.     

Local asymptotic normality for randomly censored models with applications to rank tests

For randomly right censored models we study the asymptotic behaviour of linear (rank) statistics under local alternatives. The results can be used to evaluate the asymptotic power of the corresponding tests. For instance we treat the question how to choose the best scores in order to derive asymptotically optimal (rank) tests under certain alternatives.