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Adverse Selection and Moral Hazard in Anonymous Markets

  • Klein, Tobias
  • Lambertz, Christian
  • Stahl, Konrad

We study the effects of improvements in eBay's rating mechanism on seller exit and continuing sellers' behavior. Following a large sample of sellers over time, we exploit the fact that the rating mechanism was changed to reduce strategic bias in buyer rating. That improvement did not lead to increased exit of poorly rated sellers. Yet, buyer valuation of the staying sellers – especially the poorly rated ones – improved significantly. By our preferred interpretation, the latter effect results from increased seller effort; also, when sellers have the choice between exiting (a reduction in adverse selection) and improved behavior (a reduction in moral hazard), then they prefer the latter because of lower cost.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 9501.

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Date of creation: Jun 2013
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Handle: RePEc:cpr:ceprdp:9501
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  1. 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.
  2. Resnick, Paul & Zeckhauser, Richard & Swanson, John & Lockwood, Kate, 2003. "The Value of Reputation on eBay: A Controlled Experiment," Working Paper Series rwp03-007, Harvard University, John F. Kennedy School of Government.
  3. Jaap H. Abbring & Pierre-André Chiappori & Jean Pinquet, 2003. "Moral Hazard and Dynamic Insurance Data," Journal of the European Economic Association, MIT Press, vol. 1(4), pages 767-820, 06.
  4. Michael Anderson & Jeremy Magruder, 2012. "Learning from the Crowd: Regression Discontinuity Estimates of the Effects of an Online Review Database," Economic Journal, Royal Economic Society, vol. 122(563), pages 957-989, 09.
  5. David Dranove & Ginger Zhe Jin, 2010. "Quality Disclosure and Certification: Theory and Practice," Journal of Economic Literature, American Economic Association, vol. 48(4), pages 935-63, December.
  6. Andrew Kato & Ginger Jin, 2004. "Dividing online and offline: A case study," Natural Field Experiments 00276, The Field Experiments Website.
  7. Aviva Aron-Dine & Liran Einav & Amy Finkelstein & Mark R. Cullen, 2012. "Moral Hazard in Health Insurance: How Important Is Forward Looking Behavior?," NBER Working Papers 17802, National Bureau of Economic Research, Inc.
  8. Liran Einav & Amy Finkelstein & Stephen Ryan & Paul Schrimpf & Mark Cullen, 2011. "Selection on Moral Hazard in Health Insurance," Discussion Papers 10-027, Stanford Institute for Economic Policy Research.
  9. Klein, Tobias & Lambertz, Christian & Spagnolo, Giancarlo & Stahl, Konrad, 2006. "Last Minute Feedback," CEPR Discussion Papers 5693, C.E.P.R. Discussion Papers.
  10. Amy Finkelstein & James Poterba, 2004. "Adverse Selection in Insurance Markets: Policyholder Evidence from the U.K. Annuity Market," Journal of Political Economy, University of Chicago Press, vol. 112(1), pages 183-208, February.
  11. Jeffrey A. Livingston, 2005. "How Valuable Is a Good Reputation? A Sample Selection Model of Internet Auctions," The Review of Economics and Statistics, MIT Press, vol. 87(3), pages 453-465, August.
  12. 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.
  13. Melnik, Mikhail I & Alm, James, 2002. "Does a Seller's Ecommerce Reputation Matter? Evidence from eBay Auctions," Journal of Industrial Economics, Wiley Blackwell, vol. 50(3), pages 337-49, September.
  14. Jaap H. Abbring & James J. Heckman & Pierre-André Chiappori & Jean Pinquet, 2003. "Adverse Selection and Moral Hazard In Insurance: Can Dynamic Data Help to Distinguish?," Journal of the European Economic Association, MIT Press, vol. 1(2-3), pages 512-521, 04/05.
  15. Chrysanthos Dellarocas & Charles A. Wood, 2008. "The Sound of Silence in Online Feedback: Estimating Trading Risks in the Presence of Reporting Bias," Management Science, INFORMS, vol. 54(3), pages 460-476, March.
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