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Risk Mutualization and Competition in Insurance Market

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  • M.-C. Fagart
  • N. Fombaron
  • M. Jeleva

Abstract

The aim of this paper is to analyze the impact of mutual firms on competition in the insurance market. We distinguish two actors in this market: mutual firms, which belong to their pooled members, and traditional companies, which belong to their shareholders. Our approach differs from the literature by one crucial assumption: the expected utility of the consumers depends on the size of their insurance firm, which generates network externalities in this market. Thus, the choice of a contract results in a trade-off between the premium level and the probability of that premium being ex-post adjusted. The optimal contract offered by a mutual firm involves a systematic ex-post adjustment (negative or positive), while the contracts a company offers imply a fixed premium that is possibly negatively adjusted at the end of the contractual period. In an oligopoly game, we show that three types of configurations are possible at equilibrium: either one mutual firm or insurance company is active, or a mixed structure emerges in which two or more companies share the market with or without a mutual firm. The Geneva Papers on Risk and Insurance Theory (2002) 27, 115–141. doi:10.1023/A:1021948826240
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Suggested Citation

  • M.-C. Fagart & N. Fombaron & M. Jeleva, 2001. "Risk Mutualization and Competition in Insurance Market," THEMA Working Papers 2001-25, THEMA (THéorie Economique, Modélisation et Applications), Université de Cergy-Pontoise.
    • Handle: RePEc:ema:worpap:2001-25
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    File URL: http://www.u-cergy.fr/IMG/documents//2001-25Fombaron.pdf
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    References listed on IDEAS

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    1. Katz, Michael L & Shapiro, Carl, 1985. "Network Externalities, Competition, and Compatibility," American Economic Review, American Economic Association, vol. 75(3), pages 424-440, June.
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    Cited by:

    1. Dionne, Georges & Harrington, Scott, 2017. "Insurance and Insurance Markets," Working Papers 17-2, HEC Montreal, Canada Research Chair in Risk Management.
    2. Dionne, Georges & Fombaron, Nathalie & Mimra, Wanda, 2023. "Adverse selection in insurance," Working Papers 23-5, HEC Montreal, Canada Research Chair in Risk Management.
    3. Renaud Bourlès, 2006. "How Can Insurance Companies Compete With MutualInsurers? The Role of Commitment," Working Papers halshs-00410765, HAL.
    4. David Alary & Catherine Bobtcheff & Carole Haritchabalet, 2018. "Insurance pools for new and undiversifiable risk," Post-Print hal-02440928, HAL.
    5. Dionne, Georges & Fombaron, Nathalie & Doherty, Neil, 2012. "Adverse selection in insurance contracting," Working Papers 12-8, HEC Montreal, Canada Research Chair in Risk Management.

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