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The Public-Private Sector Risk-Sharing in the French Insurance "Cat. Nat. System"


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  • Nathalie de Marcellis-Warin


  • Erwann Michel-Kerjan


Twenty years ago, the French created a so far unique insurance scheme to cover damages due to natural catastrophes. This so-called ''Cat-Nat system'' combines private insurance industry, a state-guaranteed public reinsurance and the Treasury. We provide a simple game-theoretic model which seems to capture the situation of the concrete scheme. We find that, depending on its expectations, the government modulates its policy to induce private insurers adopting one of those two opposite strategies: (i) transfer all the covered risks to the public reinsurer and therefore simply behave as indemnification intermediaries; (ii) conserve the largest share of high risks. Il y a 20 ans, la France créait un système d assurance des sinistres dus aux catastrophes naturelles qui demeure unique au monde. Le système Cat.Nat est constitué d un partenariat entre l industrie privée de l assurance, un réassureur public et le Ministère des Finances. Nous proposons ici un modèle simple de ce système qui semble refléter concrètement son fonctionnement. Nous montrons que le gouvernement, suivant ses attentes, choisit de moduler sa politique de prise en charge de tels risques afin de conduire les assureurs privés à adopter l une des deux stratégies diamétralement opposées: (i) transférer tous les risques au réassureur public et ainsi se comporter comme de simples intermédiaires financiers; (ii) décider de conserver le plus possible de hauts risques.

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Bibliographic Info

Paper provided by CIRANO in its series CIRANO Working Papers with number 2001s-60.

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Date of creation: 01 Nov 2001
Date of revision:
Handle: RePEc:cir:cirwor:2001s-60

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Keywords: catastrophe risk-sharing; French insurance system; public-private sector partnership; signaling equilibria; partage de risques catastrophiques; système français d'assurance; partenariat public/privé; équilibres de signal;

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  1. Akerlof, George A, 1970. "The Market for 'Lemons': Quality Uncertainty and the Market Mechanism," The Quarterly Journal of Economics, MIT Press, vol. 84(3), pages 488-500, August.
  2. Browne, Mark J & Hoyt, Robert E, 2000. " The Demand for Flood Insurance: Empirical Evidence," Journal of Risk and Uncertainty, Springer, vol. 20(3), pages 291-306, May.
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Cited by:
  1. Julie Doonan & Paul Lanoie & Benoit Laplante, 2002. "Environmental Performance of Canadian Pulp and Paper Plants: Why Some Do Well and Others Do Not ?," CIRANO Working Papers 2002s-24, CIRANO.
  2. Marcel Boyer & Donatella Porrini, 2002. "The Choice of Instruments for Environmental Policy: Liability or Regulation?," CIRANO Working Papers 2002s-17, CIRANO.
  3. Marcel Dagenais & Claude Montmarquette & Nathalie Viennot-Briot, 2001. "Dropout, School Performance and Working while in School : An Econometric Model with Heterogeneous Groups," CIRANO Working Papers 2001s-63, CIRANO.
  4. Bernard Sinclair-Desgagné, 2001. "Incentives in Common Agency," CIRANO Working Papers 2001s-66, CIRANO.
  5. Nathalie De Marcelis-Warin & Erwann Michel-Kerjan, 2003. "Catastrophe risk sharing and public-private partnerships : From natural disasters to terrorism," Working Papers hal-00242981, HAL.
  6. Ngo Van Long & Antoine Soubeyran, 2002. "Selective Penalization Of Polluters: An Inf-Convolution Approach," CIRANO Working Papers 2002s-40, CIRANO.
  7. Ngo Van Long & Koji Shimomura, 2002. "Relative Wealth, Status Seeking, and Catching Up," CIRANO Working Papers 2002s-09, CIRANO.
  8. Moreaux, Michel & Truchon, Michel, 2002. "Maximal Decompositions of Cost Games into Specific and Joint Costs," Cahiers de recherche 0205, Université Laval - Département d'économique.
  9. John Galbraith & Serguei Zernov & Victoria Zinde-Walsh, 2001. "Conditional Quantiles of Volatility in Equity Index and Foreign Exchange Data," CIRANO Working Papers 2001s-61, CIRANO.
  10. John Galbraith & Turgut Kisinbay, 2002. "Information Content of Volatility Forecasts at Medium-term Horizons," CIRANO Working Papers 2002s-21, CIRANO.
  11. Luigi Buzzacchi & Gilberto Turati, 2009. "Collective Risks in Local Administrations: Can a Private Insurer Be Better than a Public Mutual Fund?," Working papers 3, Former Department of Economics and Public Finance "G. Prato", University of Torino.
  12. Yoshua Bengio & Charles Dugas, 2002. "Forecasting Non-Stationary Volatility with Hyper-Parameters," CIRANO Working Papers 2002s-50, CIRANO.
  13. Serge Garcia & Alban Thomas, 2002. "An Empirical Analysis of Water Supply Contracts," CIRANO Working Papers 2002s-01, CIRANO.


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