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Differentiation and Competition in HMO Markets

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  • David Dranove
  • Anne Gron
  • Michael J. Mazzeo

Abstract

This paper examines how differentiation among Health Maintenance Organizations (HMOs) affects local market competition. Most markets for HMOs appear sufficiently unconcentrated; however, differences among HMOs may make competition less intense than the number of competitors would suggest. To investigate this possibility, we distinguish HMOs that serve only local markets from those that operate regional or national networks. We analyze how HMOs of one type affect the profitability of the other using an equilibrium model of entry and product choice. While the two types of HMOs have strong competitive effects within segments, the competitive effect of differentiated firms is negligible.

Suggested Citation

  • David Dranove & Anne Gron & Michael J. Mazzeo, 2003. "Differentiation and Competition in HMO Markets," Journal of Industrial Economics, Wiley Blackwell, vol. 51(4), pages 433-454, December.
    • Handle: RePEc:bla:jindec:v:51:y:2003:i:4:p:433-454
    DOI: 10.1111/j.0022-1821.2003.00209.x
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    References listed on IDEAS

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    1. Berry, Steven T, 1992. "Estimation of a Model of Entry in the Airline Industry," Econometrica, Econometric Society, vol. 60(4), pages 889-917, July.
    2. Jean Marie Abraham & William B. Vogt & Martin Gaynor, 2002. "Household Demand for Employer-Based Health Insurance," NBER Working Papers 9144, National Bureau of Economic Research, Inc.
    3. Bresnahan, Timothy F & Reiss, Peter C, 1991. "Entry and Competition in Concentrated Markets," Journal of Political Economy, University of Chicago Press, vol. 99(5), pages 977-1009, October.
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