Optimal Reinsurance with Multivariate Risks and Dependence Uncertainty

再保险 多元统计 计量经济学 多元分析 精算学 统计 数学 经济
作者
Tolulope Fadina,Junlei Hu,Peng Liu,Yi Xia
出处
期刊:Social Science Research Network [Social Science Electronic Publishing]
被引量:1
标识
DOI:10.2139/ssrn.4385711
摘要

In this paper we study the optimal reinsurance design from the perspective of an insurer with multiple lines of business, where the reinsurance is purchased by the insurer for each lines of business respectively. For the risk vector generated by the multiple lines of business, we suppose that the marginal distributions are fixed but the dependence structure between these risks is unknown. Due to the unknown dependence structure, the optimal strategy is investigated for the worst case scenario. We consider two types of risk measures: Value-at-Risk (VaR) and Range-Value-at-Risk (RVaR) including Expected Shortfall (ES) as a special case, and general premium principles satisfying certain conditions. To be more practical, the minimization of the total risk is conducted with both budget constraint and expected profit constraint. For VaR-based model with only two risks, it turns out that the limited stop-loss reinsurance treaty is optimal for each lines of business. For the model with more than two risks, we obtain two types of optimal reinsurance strategies if the marginals have convex or concave distributions on their tail parts by constraining the ceded loss functions to be convex or concave. Moreover, as a special case, the optimal quota-share reinsurance with dependence uncertainty has been studied. Finally, applying our findings with two risks, some numerical studies have been implemented to obtain the optimal reinsurance policies.
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