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Separating Selection and Incentive Effects in Health Insurance

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  • Gardiol, Lucien
  • Geoffard, Pierre-Yves
  • Grandchamp, Chantal

Abstract

This paper provides an analysis of the health insurance and health care consumption. A structural microeconomic model of joint demand for health insurance and health care is developed and estimated using full maximum likelihood method using Swiss insurance claims data for over 60,000 adult individuals. The estimation strategy relies on the institutional features of the Swiss system, in which each individual chooses among the same menu of contracts, ranked by the size of their deductible. The empirical analysis shows strong and robust evidence of selection effects. Nevertheless, once selection effects are controlled for, an important incentive effect ('ex-post moral hazard') remains. A decrease in the co-payment rate from 100% to 10% increases the marginal demand for health care by about 90% and from 100% to 0% by about 150%. The correlation between insurance coverage and health care expenditures may be decomposed into the two effects: 75% may be attributed to selection, and 25 % to incentive effects.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 5380.

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Date of creation: Nov 2005
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Handle: RePEc:cpr:ceprdp:5380

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Keywords: adverse selection; demand for health care; full maximum likelihood estimation; health insurance; moral hazard;

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References

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  1. Pierre-André Chiappori & Bernard Salanié, 1997. "Testing for Asymmetric Information in Insurance Markets," Working Papers 97-11, Centre de Recherche en Economie et Statistique.
  2. David M. Cutler & Richard J. Zeckhauser, 1999. "The Anatomy of Health Insurance," NBER Working Papers 7176, National Bureau of Economic Research, Inc.
  3. David M. Cutler & Sarah J. Reber, 1998. "Paying For Health Insurance: The Trade-Off Between Competition And Adverse Selection," The Quarterly Journal of Economics, MIT Press, vol. 113(2), pages 433-466, May.
  4. Chiappori, P.A. & Durand, F. & Geoffard, P.Y., 1998. "Moral Hazard and the Demand for Physician Services: First Lessons from a French Natural Experiment," DELTA Working Papers 98-05, DELTA (Ecole normale supérieure).
  5. Mullahy, John, 1998. "Much ado about two: reconsidering retransformation and the two-part model in health econometrics," Journal of Health Economics, Elsevier, vol. 17(3), pages 247-281, June.
  6. Cardon, James H & Hendel, Igal, 2001. "Asymmetric Information in Health Insurance: Evidence from the National Medical Expenditure Survey," RAND Journal of Economics, The RAND Corporation, vol. 32(3), pages 408-27, Autumn.
  7. Holly, Alberto & Gardiol, Lucien & Domenighetti, Gianfranco & Brigitte Bisig, 1998. "An econometric model of health care utilization and health insurance in Switzerland," European Economic Review, Elsevier, vol. 42(3-5), pages 513-522, May.
  8. Lucien Gardiol & Pierre-Yves Geoffard & Chantal Grandchamp, 2003. "Separating Selection and Incentive Effects: an Econometric Study of Swiss Health Insurance Claims Data," DELTA Working Papers 2003-27, DELTA (Ecole normale supérieure).
  9. Cameron, A C & P. K. Trivedi & Frank Milne & J. Piggott, 1988. "A Microeconometric Model of the Demand for Health Care and Health Insurance in Australia," Review of Economic Studies, Wiley Blackwell, vol. 55(1), pages 85-106, January.
  10. Eichner, Matthew J, 1998. "The Demand for Medical Care: What People Pay Does Matter," American Economic Review, American Economic Association, vol. 88(2), pages 117-21, May.
  11. Manning, Willard G., 1998. "The logged dependent variable, heteroscedasticity, and the retransformation problem," Journal of Health Economics, Elsevier, vol. 17(3), pages 283-295, June.
  12. Keeler, Emmett B & Newhouse, Joseph P & Phelps, C E, 1977. "Deductibles and the Demand for Medical Care Services: The Theory of a Consumer Facing a Variable Price Schedule under Uncertainty," Econometrica, Econometric Society, vol. 45(3), pages 641-55, April.
  13. 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.
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Citations

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Cited by:
  1. Erik Schokkaert & Tom Van Ourti & Diana De Graeve & Ann Lecluyse & Carine Van de Voorde, 2010. "Supplemental health insurance and equality of access in Belgium," Health Economics, John Wiley & Sons, Ltd., vol. 19(4), pages 377-395.
  2. Machado, Matilde Pinto & Pita Barros, Pedro Luis & Sanz-de-Galdeano, Anna, 2006. "Moral Hazard and the Demand for Health Services: A Matching Estimator Approach," CEPR Discussion Papers 5488, C.E.P.R. Discussion Papers.
  3. Omar Paccagnella & Vincenzo Rebba & Guglielmo Weber, 2013. "VOLUNTARY PRIVATE HEALTH INSURANCE AMONG THE OVER 50s IN EUROPE," Health Economics, John Wiley & Sons, Ltd., vol. 22(3), pages 289-315, 03.
  4. Chantal Grandchamp & Lucien Gardiol, 2008. "Does a mandatory telemedicine call prior to visiting a physician reduce costs or simply attract good risks?," Working Papers 0801, University of Lausanne, Institute of Health Economics and Management (IEMS).
  5. Michel Grignon & Marc Perronnin & John N. Lavis, 2008. "Does free complementary health insurance help the poor to access health care? Evidence from France," Health Economics, John Wiley & Sons, Ltd., vol. 17(2), pages 203-219.
  6. Trottmann, Maria & Zweifel, Peter & Beck, Konstantin, 2012. "Supply-side and demand-side cost sharing in deregulated social health insurance: Which is more effective?," Journal of Health Economics, Elsevier, vol. 31(1), pages 231-242.
  7. Pau Olivella & Marcos Vera-Hernandez, 2006. "Testing for adverse selection into private medical insurance," IFS Working Papers W06/02, Institute for Fiscal Studies.
  8. Marcel Bilger & Jean-Paul Chaze, 2008. "What Drives Individual Health Expenditure in Switzerland?," Swiss Journal of Economics and Statistics (SJES), Swiss Society of Economics and Statistics (SSES), vol. 144(III), pages 337-358, September.
  9. Legal, Renaud & Plisson, Manuel, 2008. "Assurance dépendance, effets de sélection et antisélection," Economics Papers from University Paris Dauphine 123456789/5055, Paris Dauphine University.
  10. World Bank, 2009. "Europe and Central Asia - Health insurance and competition," World Bank Other Operational Studies 3064, The World Bank.
  11. R. Kleef & K. Beck & W. Ven & R. Vliet, 2007. "Does risk equalization reduce the viability of voluntary deductibles?," International Journal of Health Care Finance and Economics, Springer, vol. 7(1), pages 43-58, March.

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