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Professional Advice

  • Marco Ottaviani

    (University College London)

  • Peter Sorensen

    (University of Copenhagen)

Professional experts offer advice with the objective of appearing well informed. Their ability is evaluated on the basis of the advice given and the realized state of the world. We model this situation as a reputational cheap-talk game with continuous signal, state, and ability type spaces. Despite allowing a message space as rich as the signal space, at best two messages are sent in the most informative equilibrium. The expert can credibly transmit only the direction but not the intensity of the information possessed. Equilibrium forecasts are then systematically less precise than under truthtelling, and learning on the expert's ability is slow.

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Paper provided by EconWPA in its series Game Theory and Information with number 9906003.

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Date of creation: 25 Jun 1999
Date of revision:
Handle: RePEc:wpa:wuwpga:9906003
Note: Type of Document - Postscript, Acrobat PDF; prepared on PC with SciWord 3.0, MiKTeX and dvips; to print on HP/PostScript/A4paper;
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  1. Bengt Holmstrom & I. Ricard & Joan Costa, 1984. "Managerial Incentives and Capital Management," Cowles Foundation Discussion Papers 729, Cowles Foundation for Research in Economics, Yale University.
  2. repec:tpr:qjecon:v:107:y:1992:i:3:p:797-817 is not listed on IDEAS
  3. Paul R. Milgrom, 1981. "Good News and Bad News: Representation Theorems and Applications," Bell Journal of Economics, The RAND Corporation, vol. 12(2), pages 380-391, Autumn.
  4. Trueman, Brett, 1994. "Analyst Forecasts and Herding Behavior," Review of Financial Studies, Society for Financial Studies, vol. 7(1), pages 97-124.
  5. Seidmann, Daniel J., 1990. "Effective cheap talk with conflicting interests," Journal of Economic Theory, Elsevier, vol. 50(2), pages 445-458, April.
  6. Wei Li, 2004. "Mind Changes in the Design of Reporting Protocols," Theory workshop papers 658612000000000085, UCLA Department of Economics.
  7. Watson, Joel, 1996. "Information Transmission When the Informed Party Is Confused," Games and Economic Behavior, Elsevier, vol. 12(1), pages 143-161, January.
  8. Jeremy C. Stein & David S. Scharfstein, 2000. "Herd Behavior and Investment: Reply," American Economic Review, American Economic Association, vol. 90(3), pages 705-706, June.
  9. Scharfstein, David S & Stein, Jeremy C, 1990. "Herd Behavior and Investment," American Economic Review, American Economic Association, vol. 80(3), pages 465-79, June.
  10. Crawford, Vincent P & Sobel, Joel, 1982. "Strategic Information Transmission," Econometrica, Econometric Society, vol. 50(6), pages 1431-51, November.
  11. Smith, L. & Sorensen, P., 1996. "Pathological Outcomes of Observational Learning," Working papers 96-19, Massachusetts Institute of Technology (MIT), Department of Economics.
  12. Zitzewitz, Eric, 2001. "Measuring Herding and Exaggeration by Equity Analysts and Other Opinion Sellers," Research Papers 1802, Stanford University, Graduate School of Business.
  13. Vijay Krishna & John Morgan, 1999. "A Model of Expertise," Game Theory and Information 9902003, EconWPA.
    • Vijay Krishna & John Morgan, 1999. "A Model of Expertise," Working Papers 154, Princeton University, Woodrow Wilson School of Public and International Affairs, Discussion Papers in Economics..
    • Krishna, V. & Morgan, J., 1999. "A Model of Expertise," Papers 206, Princeton, Woodrow Wilson School - Public and International Affairs.
  14. Ewerhart, Christian & Schmitz, Patrick W., 2000. ""Yes men", integrity, and the optimal design of incentive contracts," Journal of Economic Behavior & Organization, Elsevier, vol. 43(1), pages 115-125, September.
  15. Adam Brandenburger & Ben Polak, 1996. "When Managers Cover Their Posteriors: Making the Decisions the Market Wants to See," RAND Journal of Economics, The RAND Corporation, vol. 27(3), pages 523-541, Autumn.
  16. repec:tpr:qjecon:v:111:y:1996:i:1:p:21-40 is not listed on IDEAS
  17. Olszewski, Wojciech, 2004. "Informal communication," Journal of Economic Theory, Elsevier, vol. 117(2), pages 180-200, August.
  18. repec:tpr:qjecon:v:116:y:2001:i:1:p:189-227 is not listed on IDEAS
  19. Lamont, Owen A., 2002. "Macroeconomic forecasts and microeconomic forecasters," Journal of Economic Behavior & Organization, Elsevier, vol. 48(3), pages 265-280, July.
  20. Welch, Ivo, 2000. "Herding among security analysts," Journal of Financial Economics, Elsevier, vol. 58(3), pages 369-396, December.
  21. Peter Sorensen & Marco Ottaviani, 2000. "Herd Behavior and Investment: Comment," American Economic Review, American Economic Association, vol. 90(3), pages 695-704, June.
  22. Sobel, Joel, 1985. "A Theory of Credibility," Review of Economic Studies, Wiley Blackwell, vol. 52(4), pages 557-73, October.
  23. Piccione, Michele & Tan, Guofu, 1996. "A Simple Model of Expert and Non-Expert Bidding in First-Price Auctions," Journal of Economic Theory, Elsevier, vol. 70(2), pages 501-515, August.
  24. Andrea Prat, 2004. "The wrong kind of transparency," LSE Research Online Documents on Economics 24712, London School of Economics and Political Science, LSE Library.
  25. Bikhchandani, Sushil & Hirshleifer, David & Welch, Ivo, 1992. "A Theory of Fads, Fashion, Custom, and Cultural Change in Informational Cascades," Journal of Political Economy, University of Chicago Press, vol. 100(5), pages 992-1026, October.
  26. Susanne Lohmann, 2010. "Information Aggregation Through Costly Political Action," Levine's Working Paper Archive 197, David K. Levine.
  27. Judith Chevalier & Glenn Ellison, 1998. "Career Concerns of Mutual Fund Managers," NBER Working Papers 6394, National Bureau of Economic Research, Inc.
  28. John R. Graham, 1999. "Herding among Investment Newsletters: Theory and Evidence," Journal of Finance, American Finance Association, vol. 54(1), pages 237-268, 02.
  29. Harrison Hong & Jeffrey D. Kubik & Amit Solomon, 2000. "Security Analysts' Career Concerns and Herding of Earnings Forecasts," RAND Journal of Economics, The RAND Corporation, vol. 31(1), pages 121-144, Spring.
  30. Anat R. Admati & Paul Pfleiderer, 2004. "Broadcasting Opinions with an Overconfident Sender," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 45(2), pages 467-498, 05.
  31. Lohmann, Susanne, 1994. "Information Aggregation through Costly Political Action," American Economic Review, American Economic Association, vol. 84(3), pages 518-30, June.
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