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Moral hazard and the demand for physician services: First lessons from a French natural experiment

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  • Chiappori, Pierre-Andre
  • Durand, Franck
  • Geoffard, Pierre-Yves

Abstract

This paper presents first empirical results on moral hazard in demand for physician services, using a longitudinal dataset on 4578 individuals followed during two years. The data set contains two subgroups, one for which a copayment rate of 10% for physician visits was introduced in 1994, and an other for which no change occured during the period of the study. This enables us to use these data as coming from a controlled natural experiment. We test if the number of visits per agent was modified by this copayment rate. The data reject the hypothesis for office visits, but do not for home visits. This suggests that there is moral hazard in demand for some physician services, but also that when non-monetary costs are important, small changes in monetary price may not induce any major change in behaviour.

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Bibliographic Info

Article provided by Elsevier in its journal European Economic Review.

Volume (Year): 42 (1998)
Issue (Month): 3-5 (May)
Pages: 499-511

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Handle: RePEc:eee:eecrev:v:42:y:1998:i:3-5:p:499-511

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  1. Pierre-Andre Chiappori & Bernard Salanie, 2000. "Testing for Asymmetric Information in Insurance Markets," Journal of Political Economy, University of Chicago Press, vol. 108(1), pages 56-78, February.
  2. Chiappori, Pierre-Andre & Salanie, Bernard, 1997. "Empirical contract theory: The case of insurance data," European Economic Review, Elsevier, vol. 41(3-5), pages 943-950, April.
  3. Phelps, Charles E & Newhouse, Joseph P, 1974. "Coinsurance, the Price of Time, and the Demand for Medical Services," The Review of Economics and Statistics, MIT Press, vol. 56(3), pages 334-42, August.
  4. Dionne, G. & Gourieroux, C. & Vanasse, C., 1998. "Evidence of Adverse Selection in Automobile Insurance Markets," Papers 9822, Paris X - Nanterre, U.F.R. de Sc. Ec. Gest. Maths Infor..
  5. repec:fth:inseep:9701 is not listed on IDEAS
  6. Manning, Willard G, et al, 1987. "Health Insurance and the Demand for Medical Care: Evidence from a Randomized Experiment," American Economic Review, American Economic Association, vol. 77(3), pages 251-77, June.
  7. repec:fth:inseep:9711 is not listed on IDEAS
  8. 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.
  9. Wilson, Charles, 1977. "A model of insurance markets with incomplete information," Journal of Economic Theory, Elsevier, vol. 16(2), pages 167-207, December.
  10. Puelz, Robert & Snow, Arthur, 1994. "Evidence on Adverse Selection: Equilibrium Signaling and Cross-Subsidization in the Insurance Market," Journal of Political Economy, University of Chicago Press, vol. 102(2), pages 236-57, April.
  11. Michel Glaude & Laurent Caussat, 1993. "Dépenses médicales et couverture sociale," Économie et Statistique, Programme National Persée, vol. 265(1), pages 31-43.
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