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Calcul des Primes et Marchandage

Author

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  • Briegleb, Danielle
  • Lemaire, Jean

Abstract

Two premium calculation principles by negotiation. Using, as main tools,the classical risk exchange model by Borch andthe bargaining models of Nash and Kalai-Smorodinsky,we define two new premium calculation principles, whose main goal is to take explicitly into account the attitude towards risk of the policy-holders. Those principles are neither additive nor iterative, but they nevertheless possess several important properties: the premium is translation-invariant, it does not depend neither on the reserves nor on the portfolio of the company; it takes into account all the moments of the claim distribution; it is independent of the policy-holder's wealth but increases with his risk aversion.Coalition against an insurance company. While computing the core of this risk exchange, we show that it can be of the policy-holder's interest to coalize in order to obtain premium cuts.Le modèle d'échange de risques de Borch entre plusieurs compagnies d'assurances soucieuses d'améliorer leur situation en formant un pool de réassurance a fait l'objet de très nombreuses publications. Ce n'est que depuis quelques années cependant que l'on semble s'être aperçu que le même modèle pouvait être utilisé pour décrire toute économie d'échange, en particulier le contrat d'assurance simple entre un assuré et sa compagnie. Si l'on suppose que les préférences de l'assuré peuvent être décrites par une fonction d'utilité exponentielle, et que l'assureur est indifférent au risque en première approximation, les contrats Pareto-optimaux consistent en une couverture complète du risque, moyennant le paiement d'une prime que le critère de Pareto-optimalité ne permet pas de déterminer.

Suggested Citation

  • Briegleb, Danielle & Lemaire, Jean, 1982. "Calcul des Primes et Marchandage," ASTIN Bulletin, Cambridge University Press, vol. 13(2), pages 115-132, December.
  • Handle: RePEc:cup:astinb:v:13:y:1982:i:02:p:115-132_00
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