In this paper, we consider a risk model with stochastic return on investmen
ts. We mainly discuss the min probability, the surplus distribution at the
time of ruin and the supremum distribution of the surplus before ruin. We p
rove some properties for these distributions and derive the integro-differe
ntial equations satisfied by them. We present the relation between the ruin
probability and the supremum distribution before ruin. (C) 2001 Elsevier S
cience B.V. All rights reserved.