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arXiv 0709.2830q-fin.PMmath.OCmath.PR
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连续时间下的行为投资组合

Behavioral Portfolio Selection in Continuous Time

Hanqing Jin, Xunyu Zhou

摘要:

本文在Kahneman和Tversky的(累积)前景理论下,建立并研究了一个具有S型效用(价值)函数和概率失真的一般连续时间行为投资组合选择模型。与传统的期望效用最大化模型不同,这种行为模型很容易被错误地表述(也称为如果它的不同组成部分不能很好地相互协调,则为不适定)。确定了不适定模型的某些类别。一个系统的方法,这是从根本上不同于所采用的效用模型,开发来解决一个适定的模型,假设一个完整的市场和一般伊藤过程的资产价格。最优终端财富头寸的形式非常明确,其结构简单得令人惊讶,这让人联想到一种赌博策略,即押注于世界的良好状态,同时接受一个固定的、已知的损失,以防出现坏的情况。一个两件CRRA实用程序的例子来说明得到的一般结果,并完全解决了所有容许参数。最后讨论了行为准则对风险分配的影响。

英文摘要:

This paper formulates and studies a general continuous-time behavioral portfolio selection model under Kahneman and Tversky's (cumulative) prospect theory, featuring S-shaped utility (value) functions and probability distortions. Unlike the conventional expected utility maximization model, such a behavioral model could be easily mis-formulated (a.k.a. ill-posed) if its different components do not coordinate well with each other. Certain classes of an ill-posed model are identified. A systematic approach, which is fundamentally different from the ones employed for the utility model, is developed to solve a well-posed model, assuming a complete market and general Itô processes for asset prices. The optimal terminal wealth positions, derived in fairly explicit forms, possess surprisingly simple structure reminiscent of a gambling policy betting on a good state of the world while accepting a fixed, known loss in case of a bad one. An example with a two-piece CRRA utility is presented to illustrate the general results obtained, and is solved completely for all admissible parameters. The effect of the behavioral criterion on the risky allocations is finally discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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