我国股票期权企业所得税税收政策研究

2005年财政部、国家税务总局发布了《关于个人股票期权所得征收个人所得税问题的通知》(财税〔2005〕35号),首次明确了要对员工取得的股票期权收入征收个人所得税。但对于企业所得税方面的规定目前还是空白,需要尽快出台与股票期权激励计划有关的企业所得税方面的政策,以促进其发展。本文首先介绍我国的股票期权税收政策;其次对股票期权涉及的企业所得税方面的问题进行了探讨;最后对我国在制定股票期权企业所得税政策时须注意的问题提出了建议。     

HEDGING STRATEGIES AND MINIMAL VARIANCE PORTFOLIOS FOR EUROPEAN AND EXOTIC OPTIONS IN A LÉVY MARKET

This paper presents hedging strategies for European and exotic options in a Lévy market. By applying Taylor’s theorem, dynamic hedging portfolios are constructed under different market assumptions, such as the existence of power jump assets or moment swaps. In the case of European options or baskets of European options, static hedging is implemented. It is shown that perfect hedging can be achieved. Delta and gamma hedging strategies are extended to higher moment hedging by investing in other traded derivatives depending on the same underlying asset. This development is of practical importance as such other derivatives might be readily available. Moment swaps or power jump assets are not typically liquidly traded. It is shown how minimal variance portfolios can be used to hedge the higher order terms in a Taylor expansion of the pricing function, investing only in a risk‐free bank account, the underlying asset, and potentially variance swaps. The numerical algorithms and performance of the hedging strategies are presented, showing the practical utility of the derived results.     

试论股票期权激励的有效性条件

股票期权虽然是美国企业普遍采用的激励经理人员的模式，但是在不同的行业和不同的组织中具有不同的特点。我国企业在推行股票期权激励过程中，应该注意到这只是激励经理人员的一种模式，注意到股票期权的采用是对经理人员薪酬结构的调整，特别要考虑到我国企业所面临的现实环境中还存在着许多不利于股票期权激励模式发挥效率的限制条件。否则，股票期权激励就难以产生预期的效果。     

Minimum option prices under decreasing absolute risk aversion

We establish bounds on option prices in an economy where the representative investor has an unknown utility function that is constrained to belong to the family of nonincreasing absolute risk averse functions. For any distribution of terminal consumption, we identify a procedure that establishes the lower bound of option prices. We prove that the lower bound derives from a particular negative exponential utility function. We also identify lower bounds of option prices in a decreasing relative risk averse economy. For this case, we find that the lower bound is determined by a power utility function. Similar to other recent findings, for the latter case, we confirm that under lognormality of consumption, the Black Scholes price is a lower bound. The main advantage of our bounding methodology is that it can be applied to any arbitrary marginal distribution for consumption. This revised version was published online in June 2006 with corrections to the Cover Date.     

ESO激励的风险、对策研究

管理层股票期权(ESO)是对公司高层管理人员的一种较好激励方式,但局于本身激励相关内在因素所限,仍存在激励失效的可能。本文在概述股票期权激励特点的基础上,建立模型探讨其内在风险,并在最后给出相应对策建议。     

住房抵押贷款支持证券的利率风险度量——基于"建元2005-1 MBS"A证券的实证

住房抵押贷款支持证券中隐含期权的存在导致未来现金流不确定,久期和凸度等利率风险管理工具不再适用。本文基于OAS理念建立了住房抵押贷款支持证券的利率风险度量过程:采用多项式样条函数法构建零息票收益率曲线,采用Vasicek模型描述动态利率期限结构,通过蒙特卡罗方法模拟利率路径并确定未来现金流,采用ARMA模型描述和预测提前偿付率,进而计算出OAS、有效久期和有效凸度的值。最后以建元2005-1MBSA证券为对象进行了实证研究。     

期权价值对排水管网水价的影响研究

水业巨大的供需矛盾决定了城市水业的市场化方向,受制于污水处理的低产能利用率,排水管网建设成为水务发展的瓶颈。通过引入再投资管网建设工程的期权价值,构建了考虑期权价值的水价模型,得出的修正临界水价低于传统净现值模型得出的水价,形成的理论分析成果为排水管网建设工程的合理水价确定提供理论依据和支持。     

Continuous-time American foreign exchange option pricing model

The flexibility of American foreign exchange option at exertion time can be measured by time value of capital. The paper develops a continuous-time American foreign exchange option pricing model using Black-Scholes currency model, CMG theorem of measure change and Ito calculus. The model is more simple and reliable than others.