Abstract
In this paper, we study optimal dividend problems in a compound Poisson risk process with constant interest on investments. Throughout the paper, we assume that the rate of dividend pay out is bounded by some positive constant. It is shown that the optimal value function of the dividends can be characterized by the Hamilton–Jacobi–Bellman equation. For the case of an exponential claim amount distribution, it is shown that the optimal dividend strategy is a threshold strategy. Then the Laplace transform of the time of ruin, under a threshold strategy, can be calculated. Kummer's confluent hypergeometric equation and confluent hypergeometric functions play a key role in this paper.
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