Optimal Control with Restrictions for a Diffusion Risk Model Under Constant Interest Force
Optimal Control with Restrictions for a Diffusion Risk Model Under Constant Interest Force
复制标题
恒定利益力下扩散风险模型的带限制最优控制
DOI:
10.1007/s00245-015-9295-3
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发表时间:
2016-02
影响因子:
1.8
通讯作者:
Junyi Guo
中科院分区:
文献类型:
--
作者:
Xiaofan Peng;Lihua Bai;Junyi Guo
In this paper, we study optimal dividend problems in a diffusion risk model for two different cases depending on whether reinsurance is incorporated. In either case, the dividend rate is bounded above by a constant, and the company earns investment income at a constant force of interest. Unlike existing approaches in the literature dealing with optimal problems with interest, we allow the force of interest to be greater than the discount factor, and we use a different method to solve the corresponding Hamilton–Jacobi–Bellman (HJB) equation instead of introducing a confluent hypergeometric function. We conclude that the optimal dividend policy is of a threshold type and show that the corresponding dividend barrier is nondecreasing in the dividend rate bound. In cases where there is no reinsurance, we construct an auxiliary reflecting control problem to find the nonzero dividend barrier. If proportional reinsurance is purchased, the optimal reinsurance strategy looks somewhat strange. The optimal retention level of risk first increases monotonically with risk reserve to some possible value (less than) and then stays at levelfor a while or, ifhas been reached, finally, it decreases to 0.
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