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Moral Hazard, Adverse Selection and Health Expenditures: A Semiparametric Analysis

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  • Patrick Bajari
  • Han Hong
  • Ahmed Khwaja

Abstract

Theoretical models predict asymmetric information in health insurance markets may generate inefficient outcomes due to adverse selection and moral hazard. However, previous empirical research has found it difficult to disentangle adverse selection from moral hazard in health care. We empirically study this question by using data from the Health and Retirement Study to estimate a structural model of the demand for health insurance and medical care. Using a two-step semi-parametric estimation strategy we find significant evidence of moral hazard, but not of adverse selection.

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  • Patrick Bajari & Han Hong & Ahmed Khwaja, 2006. "Moral Hazard, Adverse Selection and Health Expenditures: A Semiparametric Analysis," NBER Working Papers 12445, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:12445
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    Cited by:

    1. Tobias J. Klein & Christian Lambertz & Konrad O. Stahl, 2016. "Market Transparency, Adverse Selection, and Moral Hazard," Journal of Political Economy, University of Chicago Press, vol. 124(6), pages 1677-1713.
    2. Liran Einav & Amy Finkelstein & Stephen P. Ryan & Paul Schrimpf & Mark R. Cullen, 2013. "Selection on Moral Hazard in Health Insurance," American Economic Review, American Economic Association, vol. 103(1), pages 178-219, February.
    3. Andinet Woldemichael & Daniel Gurara & Abebe Shimeles, 2019. "The Impact of Community Based Health Insurance Schemes on Out-of-Pocket Healthcare Spending: Evidence from Rwanda," IMF Working Papers 2019/038, International Monetary Fund.
    4. George-Levi Gayle & Limor Golan & Robert A. Miller, "undated". "Promotion, Turover and Compensation in the Executive Market," GSIA Working Papers 2008-E32, Carnegie Mellon University, Tepper School of Business.
    5. Bhattacharya, Jay & Packalen, Mikko, 2012. "The other ex ante moral hazard in health," Journal of Health Economics, Elsevier, vol. 31(1), pages 135-146.
    6. Woldemichael, Andinet & Gurara, Daniel Zerfu & Shimeles, Abebe, 2016. "Community-Based Health Insurance and Out-of-Pocket Healthcare Spending in Africa: Evidence from Rwanda," IZA Discussion Papers 9922, Institute of Labor Economics (IZA).
    7. Bolhaar, Jonneke & Lindeboom, Maarten & van der Klaauw, Bas, 2012. "A dynamic analysis of the demand for health insurance and health care," European Economic Review, Elsevier, vol. 56(4), pages 669-690.
    8. Daniel McFadden & Carlos Noton & Pau Olivella, "undated". "Remedies for Sick Insurance," Working Papers 620, Barcelona School of Economics.
    9. Florian Heiss & Daniel McFadden & Joachim Winter, 2010. "Mind the Gap! Consumer Perceptions and Choices of Medicare Part D Prescription Drug Plans," NBER Chapters, in: Research Findings in the Economics of Aging, pages 413-481, National Bureau of Economic Research, Inc.
    10. Liran Einav & Amy Finkelstein & Jonathan Levin, 2010. "Beyond Testing: Empirical Models of Insurance Markets," Annual Review of Economics, Annual Reviews, vol. 2(1), pages 311-336, September.
    11. Jeske, Karsten & Kitao, Sagiri, 2009. "U.S. tax policy and health insurance demand: Can a regressive policy improve welfare?," Journal of Monetary Economics, Elsevier, vol. 56(2), pages 210-221, March.
    12. Stahl, Konrad & Klein, Tobias & Lambertz, Christian, 2013. "Adverse Selection and Moral Hazard in Anonymous Markets," CEPR Discussion Papers 9501, C.E.P.R. Discussion Papers.
    13. Patrick Bajari & Christina Dalton & Han Hong & Ahmed Khwaja, 2014. "Moral hazard, adverse selection, and health expenditures: A semiparametric analysis," RAND Journal of Economics, RAND Corporation, vol. 45(4), pages 747-763, December.
    14. Bernal Lobato, N., 2014. "Essays in applied microeconomics," Other publications TiSEM 9b638b3d-2f83-452a-b2c8-c, Tilburg University, School of Economics and Management.
    15. Hubert P. Janicki, 2011. "Distributional Effects of Public Health Insurance Reform," 2011 Meeting Papers 423, Society for Economic Dynamics.
    16. Bernal, Noelia & Carpio, Miguel A. & Klein, Tobias J., 2017. "The effects of access to health insurance: Evidence from a regression discontinuity design in Peru," Journal of Public Economics, Elsevier, vol. 154(C), pages 122-136.
    17. Carine Franc & Marc Perronnin & Aurélie Pierre, 2010. "Subscribing to Supplemental Health Insurance in France: A Dynamic Analysis of Adverse Selection," Working Papers DT35, IRDES institut for research and information in health economics, revised Dec 2010.
    18. Armstrong, Timothy B. & Bertanha, Marinho & Hong, Han, 2014. "A fast resample method for parametric and semiparametric models," Journal of Econometrics, Elsevier, vol. 179(2), pages 128-133.
    19. Duarte, Fabian, 2012. "Price elasticity of expenditure across health care services," Journal of Health Economics, Elsevier, vol. 31(6), pages 824-841.
    20. Florian Heiss & Daniel McFadden & Joachim Winter, 2008. "Mind the Gap! Consumer Perceptions and Choices," MEA discussion paper series 08156, Munich Center for the Economics of Aging (MEA) at the Max Planck Institute for Social Law and Social Policy.
    21. Janicki, Hubert P., 2014. "The role of asset testing in public health insurance reform," Journal of Economic Dynamics and Control, Elsevier, vol. 44(C), pages 169-195.

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    JEL classification:

    • C14 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Semiparametric and Nonparametric Methods: General
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • I11 - Health, Education, and Welfare - - Health - - - Analysis of Health Care Markets

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