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Collusion in a One-Period Insurance Market with Adverse Selection

Author

Listed:
  • Willington Manuel

    (Universidad Adolfo Ibáñez)

  • Alegría Alexander

    (Pontificia Universidad Javeriana de Cali)

Abstract

We show that collusive-seeming outcomes may occur in equilibrium in a one-period competitive insurance market characterized by adverse selection. We build on the Inderst and Wambach (2001) model and assume that insurance is compulsory and involves a minimum premium and minimum coverage; these are common features in many health systems. In this setup we show that there is a range of equilibria, from the zero profit one where low-risks implicitly subsidize high risks, to one where firms obtain profits with both types of consumers. Moreover, we show that rents only partially dissipate if we assume free entry. Along these equilibria, high risks always obtain full insurance, while the low risks' coverage decreases as the firms' profits increase.

Suggested Citation

  • Willington Manuel & Alegría Alexander, 2012. "Collusion in a One-Period Insurance Market with Adverse Selection," The B.E. Journal of Economic Analysis & Policy, De Gruyter, vol. 12(1), pages 1-32, April.
    • Handle: RePEc:bpj:bejeap:v:12:y:2012:i:1:n:14
    DOI: 10.1515/1935-1682.2592
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    References listed on IDEAS

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    1. Cummins, J. David & Rubio-Misas, Maria, 2006. "Deregulation, Consolidation, and Efficiency: Evidence from the Spanish Insurance Industry," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 38(2), pages 323-355, March.
    2. Claudio Agostini & Eduardo Saavedra & Manuel Willington, 2010. "Collusion Among Health Insurers in Chile: Good, Bad, and Ugly Reasons in a Split Decision," Antitrust Chronicle, Competition Policy International, vol. 7.
    3. John C. Harsanyi & Reinhard Selten, 1988. "A General Theory of Equilibrium Selection in Games," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262582384, April.
    4. Joseph E. Stiglitz, 1977. "Monopoly, Non-linear Pricing and Imperfect Information: The Insurance Market," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 44(3), pages 407-430.
    5. Michael Rothschild & Joseph Stiglitz, 1976. "Equilibrium in Competitive Insurance Markets: An Essay on the Economics of Imperfect Information," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 90(4), pages 629-649.
    6. Robert Wilson, 1979. "Auctions of Shares," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 93(4), pages 675-689.
    7. Peski, Marcin, 2010. "Generalized risk-dominance and asymmetric dynamics," Journal of Economic Theory, Elsevier, vol. 145(1), pages 216-248, January.
    8. William C. Hsiao & R. Paul Shaw, 2007. "Social Health Insurance for Developing Nations," World Bank Publications - Books, The World Bank Group, number 6860.
    9. Smart, Michael, 2000. "Competitive Insurance Markets with Two Unobservables," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 41(1), pages 153-169, February.
    10. Marie Allard & Jean-Paul Cresta & Jean-Charles Rochet, 1997. "Pooling and Separating Equilibria in Insurance Markets with Adverse Selection and Distribution Costs*," The Geneva Risk and Insurance Review, Palgrave Macmillan;International Association for the Study of Insurance Economics (The Geneva Association), vol. 22(2), pages 103-120, December.
    11. Edmundo Beteta & Manuel Willington, 2009. "Planes Mínimos Obligatorios en Mercados de Seguros de Salud Segmentados," Estudios de Economia, University of Chile, Department of Economics, vol. 36(2 Year 20), pages 217-241, December.
    12. Wholey, Douglas & Feldman, Roger & Christianson, Jon B. & Engberg, John, 1996. "Scale and scope economies among health maintenance organizations," Journal of Health Economics, Elsevier, vol. 15(6), pages 657-684, December.
    13. Given, Ruth S., 1996. "Economies of scale and scope as an explanation of merger and output diversification activities in the health maintenance organization industry," Journal of Health Economics, Elsevier, vol. 15(6), pages 685-713, December.
    14. Veronica Guerrieri & Robert Shimer & Randall Wright, 2010. "Adverse Selection in Competitive Search Equilibrium," Econometrica, Econometric Society, vol. 78(6), pages 1823-1862, November.
    15. Krishnendu Dastidar, 2001. "Collusive outcomes in price competition," Journal of Economics, Springer, vol. 73(1), pages 81-93, February.
    16. Hellwig, Martin, 1987. "Some recent developments in the theory of competition in markets with adverse selection ," European Economic Review, Elsevier, vol. 31(1-2), pages 319-325.
    17. Yin Choo Yap, 2009. "The Effects of Economies of Scale and Diversification on the Cost Structure of the Malaysian Non-life Insurance Industry," Asia-Pacific Journal of Risk and Insurance, De Gruyter, vol. 4(1), pages 1-29, November.
    18. Arthur Snow, 2009. "On the Possibility of Profitable Self‐Selection Contracts in Competitive Insurance Markets," Journal of Risk & Insurance, The American Risk and Insurance Association, vol. 76(2), pages 249-259, June.
    19. Inderst, Roman & Wambach, Achim, 2001. "Competitive insurance markets under adverse selection and capacity constraints," European Economic Review, Elsevier, vol. 45(10), pages 1981-1992, December.
    20. Hellwig, Martin F., 1988. "A note on the specification of interfirm communication in insurance markets with adverse selection," Journal of Economic Theory, Elsevier, vol. 46(1), pages 154-163, October.
    21. Ronald D. Fischer & Pablo Serra, 1997. "Análisis económico del sistema de seguros de salud en Chile," Documentos de Trabajo 17, Centro de Economía Aplicada, Universidad de Chile.
    22. Partha Dasgupta & Eric Maskin, 1986. "The Existence of Equilibrium in Discontinuous Economic Games, I: Theory," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 53(1), pages 1-26.
    23. Hanweck, Gerald A. & Hogan, Arthur M. B., 1996. "The structure of the property/casualty insurance industry," Journal of Economics and Business, Elsevier, vol. 48(2), pages 141-155, May.
    24. Asheim, Geir B. & Nilssen, Tore, 1996. "Non-discriminating renegotiation in a competitive insurance market," European Economic Review, Elsevier, vol. 40(9), pages 1717-1736, December.
    25. Partha Dasgupta & Eric Maskin, 1986. "The Existence of Equilibrium in Discontinuous Economic Games, II: Applications," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 53(1), pages 27-41.
    26. Lloyd-Sherlock, Peter, 2005. "Health sector reform in Argentina: a cautionary tale," Social Science & Medicine, Elsevier, vol. 60(8), pages 1893-1903, April.
    27. Joseph P. Newhouse, 1996. "Reimbursing Health Plans and Health Providers: Efficiency in Production versus Selection," Journal of Economic Literature, American Economic Association, vol. 34(3), pages 1236-1263, September.
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    Cited by:

    1. Willington, Manuel & Navarro, Lucas, 2015. "Work hours regulation in a search economy with adverse selection," Economics Letters, Elsevier, vol. 136(C), pages 46-48.

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    More about this item

    Keywords

    adverse selection; collusion; insurance; capacity constraints;
    All these keywords.

    JEL classification:

    • L41 - Industrial Organization - - Antitrust Issues and Policies - - - Monopolization; Horizontal Anticompetitive Practices
    • I11 - Health, Education, and Welfare - - Health - - - Analysis of Health Care Markets

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