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Zbl 1100.60021
Jacobsen, Martin
The time to ruin for a class of Markov additive risk process with two-sided jumps. (English)
[J] Adv. Appl. Probab. 37, No. 4, 963-992 (2005). ISSN 0001-8678

Ruin problems for a special Markov additive process are considered. The model process locally behaves like a real-valued Brownian motion with some drift and variance, these both depending on an underlying Markov chain that is also used to generate the claims arrival process. Thus, claims arrive according to a renewal process with waiting times of phase type. Positive claims (downward jumps) are always possible but negative claims (upward jumps) are also allowed. The claims are assumed to form an independent, identically distributed sequence, independent of everything else. The time for ruin is the (stopping) time at which the process becomes strictly negative, and the undershoot is the absolute value of the process at the time to ruin.\par As main results, the joint Laplace transform of the time to ruin and the undershoot at ruin, as well as the probability of ruin, are explicitly determined under the assumption that the Laplace transform of the positive claims is a rational function. Both the joint Laplace transform and the ruin probability are decomposed according to the type of ruin: ruin by jump or ruin by continuity. The methods used involve martingale techniques by first finding partial eigenfunctions for the generator of the Markov process composed of the risk process and the underlying Markov chain. Moreover, complex function theory is applied.
[Uta Freiberg (Canberra)]

MSC 2000:: *60G40 Optimal stopping
60K15 Markov renewal processes
60E10 Transforms of probability distributions
60G44 Martingales with continuous parameter
60J25 Markov processes with continuous parameter
91B30 Risk theory etc.

Keywords: Markov process; optional sampling; risk model; martingale; probability of ruin; time to ruin; undershoot; additive process

Cited in: Zbl pre06127035

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