# Réassurance, solvavilité et probabilté

Exposé à Lyon dans le cadre du projet ANR AST& Risk.

In this talk, we consider optimal reinsurance from an insurer’s point of view. Given a (low) ruin probability target, the insurers wants to find the optimal risk transfer mechanism, i.e. either a proportional or a nonproportional reinsurance treaty. In the first case, a simple Monte Carlo algorithm can be designed, but in the nonproportional case, so far, no simple (and efficient) algorithm has been proposed