A BSDE approach to a risk-based optimal investment of an insurer

作者：Elliott Robert J^*; Siu Tak Kuen

来源：Automatica, 2011, 47(2): 253-261.

DOI：10.1016/j.automatica.2010.10.032

• Backward stochastic differential equation
• Optimal investment
• Insurance company
• Convex risk measure
• Diffusion approximation
• Zero-sum stochastic differential game
• Existence and uniqueness of optimal strategies

We discuss a backward stochastic differential equation, (BSDE), approach to a risk-based, optimal investment problem of an insurer. A simplified continuous-time economy with two investment vehicles, namely, a fixed interest security and a share, is considered. The insurer's risk process is modeled by a diffusion approximation to a compound Poisson risk process. The goal of the insurer is to select an optimal portfolio so as to minimize the risk described by a convex risk measure of his/her terminal wealth. The optimal investment problem is then formulated as a zero-sum stochastic differential game between the insurer and the market. The BSDE approach is used to solve the game problem. It leads to a simple and natural approach for the existence and uniqueness of an optimal strategy of the game problem without Markov assumptions. Closed-form solutions to the optimal strategies of the insurer and the market are obtained in some particular cases.

• 出版日期2011-2