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arXiv 2109.06378q-fin.PMq-fin.MF
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一个具有状态依赖消费下限约束的消费投资模型

A consumption-investment model with state-dependent lower bound constraint on consumption

Chonghu Guan, Zuo Quan Xu, Fahuai Yi

摘要:

本文在Black-Scholes框架下研究了一个终生消费投资问题,其中消费率服从一个线性依赖于财富的下界约束。它是一个具有状态依赖控制约束的随机控制问题,标准的随机控制理论不能直接应用于它。我们克服了这一点,将其转化为一个等价的随机控制问题,其中的控制约束是状态无关的,使标准理论可以应用。当约束是齐次的时,我们给出了一个显式的最优消费投资策略。当约束为非齐次时,利用微分方程方法证明了价值函数是三阶连续可微的,并给出了最优消费投资策略的反馈形式.根据我们的研究结果,如果一个人关注的是长期消费而不是短期消费,那么他应该总是尽可能少地消费;否则,当他的财富超过阈值时,他应该最佳地消费,当他的财富低于阈值时,他应该尽可能少地消费。

英文摘要:

This paper studies a life-time consumption-investment problem under the Black-Scholes framework, where the consumption rate is subject to a lower bound constraint that linearly depends on her wealth. It is a stochastic control problem with state-dependent control constraint to which the standard stochastic control theory cannot be directly applied. We overcome this by transforming it into an equivalent stochastic control problem in which the control constraint is state-independent so that the standard theory can be applied. We give an explicit optimal consumption-investment strategy when the constraint is homogeneous. When the constraint is non-homogeneous, it is shown that the value function is third-order continuously differentiable by differential equation approach, and a feedback form optimal consumption-investment strategy is provided. According to our findings, if one is concerned with long-term more than short-term consumption, then she should always consume as few as possible; otherwise, she should consume optimally when her wealth is above a threshold, and consume as few as possible when her wealth is below the threshold.

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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