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Coûts de l’autoprotection et équilibre d’un marché de l’assurance concurrentiel

Listed author(s):
  • Kambia-Chopin, Bidénam

    (Thema)

This paper considers a competitive insurance market under moral hazard and adverse selection, in which both the agent’s preventive effort and self protection costs are unobservable by the insurance companies. We show that the agent provides the same level of self-protection than without adverse selection. The agent who has a higher marginal cost is proposed his moral hazard contract whereas adverse selection may make the lower marginal cost agent’s coverage to decrease. Finally, equilibrium may not exist. Nous considérons un marché concurrentiel de l’assurance en présence d’aléa moral dans lequel le niveau du coût de l’autoprotection de l’assuré est son information privée. Nous caractérisons alors l’équilibre en contrats du marché en supposant qu’il existe deux types d’agents : un type à faible coût marginal de l’effort et un autre dont le coût marginal est élevé. D’une part, nous montrons que le niveau de l’autoprotection de l’agent à l’équilibre est le même que dans la situation d’aléa moral pur. D’autre part, nous montrons qu’à l’équilibre les agents dont le coût marginal de l’effort est élevé obtiennent le même contrat que dans la situation d’aléa moral pur alors que l’autre type d’agents peut obtenir une couverture d’assurance plus faible. Enfin, l’existence de l’équilibre n’est pas toujours garantie.

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Article provided by Société Canadienne de Science Economique in its journal L'Actualité économique.

Volume (Year): 79 (2003)
Issue (Month): 3 (Septembre)
Pages: 327-347

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Handle: RePEc:ris:actuec:v:79:y:2003:i:3:p:327-347
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  1. M.-C. Fagart & B. Kambia-Chopin, 2002. "Aléa moral et sélection adverse sur le marché de l’assurance," THEMA Working Papers 2002-09, THEMA (THéorie Economique, Modélisation et Applications), Université de Cergy-Pontoise.
  2. Michael Rothschild & Joseph Stiglitz, 1976. "Equilibrium in Competitive Insurance Markets: An Essay on the Economics of Imperfect Information," The Quarterly Journal of Economics, Oxford University Press, vol. 90(4), pages 629-649.
  3. Riley, John G, 1979. "Informational Equilibrium," Econometrica, Econometric Society, vol. 47(2), pages 331-359, March.
  4. Bruno Jullien & Bernard Salanié & François Salanié, 2000. "Screening Risk-Averse Agents Under Moral Hazard," Working Papers 2000-41, Centre de Recherche en Economie et Statistique.
  5. Stewart, Jay, 1994. "The Welfare Implications of Moral Hazard and Adverse Selection in Competitive Insurance Markets," Economic Inquiry, Western Economic Association International, vol. 32(2), pages 193-208, April.
  6. Arnott, Richard J & Stiglitz, Joseph E, 1988. " The Basic Analytics of Moral Hazard," Scandinavian Journal of Economics, Wiley Blackwell, vol. 90(3), pages 383-413.
  7. Chassagnon, A. & Chiappori, P.A., 1994. "Insurance Under Moral Hazard and Adverse Selection: The Case of Pure Competition," Papers 28, Laval - Laboratoire Econometrie.
  8. Richard Arnott & Joseph Stiglitz, 1991. "Equilibrium in Competitive Insurance Markets with Moral Hazard," NBER Working Papers 3588, National Bureau of Economic Research, Inc.
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