On Discrete-Time Dynamic Programming in Insurance: Exponential Utility and Minimizing the Ruin Probability

Manfred Schäl

Scandinavian Actuarial Journal, 2004, vol. 2004, issue 3, 189-210

Abstract: This paper studies an insurance model where the risk process can be controlled by reinsurance and by investment in a financial market. The performance criterion is either the expected exponential utility of the terminal surplus or the ruin probability. It is shown that the problems can be imbedded in the framework of discrete-time stochastic dynamic programming but with some special features. A short introduction to control theory with infinite state space is provided which avoids the measure-theoretic apparatus by use of the so-called structure assumption. Moreover, in order to treat models without discount factor, a weak contraction property is derived. Explicit conditions are obtained for the optimality of employing no reinsurance.

Date: 2004
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DOI: 10.1080/03461230110106507

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