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arXiv 1404.7698q-fin.PM
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带消费约束的最优消费投资模型

An Optimal Consumption-Investment Model with Constraint on Consumption

Zuo Quan Xu, Fahuai Yi

摘要:

考虑了一个具有约束的连续时间消费-投资模型,投资者的消费率和财富分配分别为无风险资产和风险资产,其波动服从对数布朗运动.消费率受到一个上限约束,该约束线性依赖于投资者的财富,并且禁止破产。投资者的目标是在无限交易时间内最大化消费的总期望贴现效用。结果表明,价值函数是(二阶)光滑的,除了(已知)例外点的唯一可能性,最优消费-投资策略以财富的封闭反馈形式给出,与现有的不涉及价值函数的工作相反.根据该模型,投资者无论其财务状况如何,都应采取与Merton模型相同的最优投资策略。相比之下,最优消费策略确实取决于投资者的财务状况:当他处于糟糕的状况时,他应该使用与Merton模型中类似的消费策略,当他处于良好状况时,尽可能多地消费。

英文摘要:

A continuous-time consumption-investment model with constraint is considered for a small investor whose decisions are the consumption rate and the allocation of wealth to a risk-free and a risky asset with logarithmic Brownian motion fluctuations. The consumption rate is subject to an upper bound constraint which linearly depends on the investor's wealth and bankruptcy is prohibited. The investor's objective is to maximize total expected discounted utility of consumption over an infinite trading horizon. It is shown that the value function is (second order) smooth everywhere but a unique possibility of (known) exception point and the optimal consumption-investment strategy is provided in a closed feedback form of wealth, which in contrast to the existing work does not involve the value function. According to this model, an investor should take the same optimal investment strategy as in Merton's model regardless his financial situation. By contrast, the optimal consumption strategy does depend on the investor's financial situation: he should use a similar consumption strategy as in Merton's model when he is in a bad situation, and consume as much as possible when he is in a good situation.

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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