PARTIAL HEDGING IN A STOCHASTIC VOLATILITY ENVIRONMENT

We consider the problem of partial hedging of derivative risk in a stochastic volatility environment. It is related to state-dependent utility maximization problems in classical economics. We derive the dual problem from the Legendre transform of the associated Bellman equation and interpret the optimal strategy as the perfect hedging strategy for a modified claim. Under the assumption that volatility is fast mean-reverting and using a singular perturbation analysis, we derive approximate value functions and strategies that are easy to implement and study. The analysis identifies the usual mean historical volatility and the harmonically averaged long-run volatility as important statistics for such optimization problems without further specification of a stochastic volatility model. The approximation can be improved by specifying a model and can be calibrated for the leverage effect from the implied volatility skew. We study the effectiveness of these strategies using simulated stock paths.     

Logarithmic quasi-homothetic preferences

We study a class of quasi-homothetic preferences, which result in demands that are logarithmic in own prices when these have a negligible impact on aggregate prices (as in monopolistic competition models). Thus marginal revenues are computationally friendly and well behaved.     

预期效用论与前景理论解析

预期效用论和前景理论是研究金融领域不确定性决策的两个主要理论。预期效用论认为投资个体面对不确定性状态下的投资决策是基于期末财富和结果发生的概率大小而做出的,个体在决策过程中被假定具有富有理性预期、风险厌恶以及遵循效用最大化原则等特点。前景理论认为个体做选择时会经过两个阶段:编辑阶段和评价阶段,"编辑"主要是收集和整理多个预期的信息,进行相应的预处理。"评价"就是通过结合两个主观的标准———价值函数和决策权重函数,对每个被编辑过的预期加以评价,从中选出价值最高预期信息。可见,这两个理论关于个体决策选优的"依据"相去甚远。     

The Minimal Entropy Martingale Measures for Exponential Additive Processes

In this paper, we will consider exponential additive processes as a financial market model. Under a mild condition, we will determine the minimal entropy martingale measures (MEMMs) for the exponential additive processes. To this end, we will prepare several results on the exponential moment of additive processes and integrals based on them. As an application of our result, we will deduce optimal strategy for exponential utility maximization problem. We will also investigate our result through several examples, such as time-dependent versions of double Poisson model, Merton model and Kou model.     

The Analysis of Cost Utilities in Chinese Petrochemical Enterprises

The extensive applications of the flexible manufacturing （management） system and management information system are ultimate characteristics of economic process now and future. Those not only promote the trend of high gradation of cost system and the differences of cost utilities determined by their inconsistencies, but also eliminate the validity of the traditional cost control based on the thrift and monev-erubbing consciousness.     

基于消费者行为理论的森林食品产业发展潜力分析

文章运用经济学的消费行为理论,从消费者对森林食品的偏好分析入手,分析了森林食品具有二元价值结构的特征,推出大多数的消费者对森林食品具有超满足性消费偏好的特性,其效用函数有非1正实根。在此基础上,结合我国森林食品产业发展的特征,导出森林食品产业的需求模型。以期为森林食品产业组织的完善及竞争力的提升提供市场需求的理论分析依据。     

Pricing of the time-change risks

We develop an equilibrium endowment economy with Epstein-Zin recursive utility and a Lévy time-change subordinator, which represents a clock that connects business and calendar time. Our setup provides a tractable equilibrium framework for pricing non-Gaussian jump-like risks induced by the time-change, with closed-form solutions for asset prices. Persistence of the time-change shocks leads to predictability of consumption and dividends and time-variation in asset prices and risk premia in calendar time. In numerical calibrations, we show that the risk compensation for Lévy risks accounts for about one-third of the overall equity premium.     

Risk, uncertainty, and option exercise

Many economic decisions can be described as an option exercise or optimal stopping problem under uncertainty. Motivated by experimental evidence such as the Ellsberg Paradox, we follow Knight (1921) and distinguish risk from uncertainty. To capture this distinction, we adopt the multiple-priors utility model. We show that the impact of ambiguity on the option exercise decision depends on the relative degrees of ambiguity about continuation payoffs and termination payoffs. Consequently, ambiguity may accelerate or delay option exercise. We apply our results to investment and exit problems, and show that the myopic NPV rule can be optimal for an agent having an extremely high degree of ambiguity aversion.     

双重垄断下的城市公用事业规制目标选择

城市公用事业通常是自然垄断行业,在我国从计划经济向市场经济转轨的过程中,它还具有较强的行政垄断性。我国对自然垄断与行政垄断并存的公用事业的规制改革与西方国家有所不同,应区别两种垄断的不同性质,有针对性地确定改革目标。本文阐述了我国城市公用事业的自然垄断特性,分析了其行政垄断的根源及表现,对双重垄断下的城市公用事业规制目标选择提出了一些建议。     

A decision method for supplier selection in multi-service outsourcing

Although supplier selection in multi-service outsourcing is a very important decision problem, research concerning this issue is still relatively scarce. This paper proposes a decision method for selecting a pool of suppliers for the provision of different service process/product elements. It pioneers the use of collaborative utility between partner firms for supplier selection. A multi-objective model is built to select desired suppliers. This model is proved to be NP-hard, so we develop a multi-objective algorithm based on Tabu search for solving it. We then use an example to show the applicability of the proposed model and algorithm. Extensive computational experiments are also conducted to further test the performance of the proposed algorithm.