Optimal investment strategy for a family with a random household expenditure under the CEV model
Optimal investment strategy for a family with a random household expenditure under the CEV model
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CEV模型下家庭支出随机的家庭最优投资策略
DOI:
10.1080/03610926.2020.1851718
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发表时间:
2020-11
影响因子:
0.8
通讯作者:
Hailong Liu
中科院分区:
文献类型:
--
作者:
Danping Li;Xiaotao Liu;Hailong Liu
Abstract This paper considers an optimal investment strategy to maximize the expected constant absolute risk averse (CARA) utility of the terminal wealth for a family in the presence of stochastic household expenditure under the constant elasticity of variance (CEV) model. Since the corresponding Hamilton-Jacobi-Bellman (HJB) equation is difficult to solve for the high dimensionality and nonlinearity, previous work only gives an approximate numerical solution for some special model parameters under the slow-fluctuating regime assumption. In this paper, by directly conjecturing the functional form of the value function, we transform the HJB equation into two one-dimensional parabolic partial differential equations (pdes) and further find their explicit solutions via the Feynman-Kac formula. We prove that the exact and explicit solution for the value function as well as the optimal investment strategy can be expressed as integral of confluent hyper-geometric function. Finally, numerical examples are provided to illustrate the effects of parameters on the optimal strategies.
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DOI:
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DOI:
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