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Aggregation of Expert Opinions

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Author Info
Dino Gerardi () (Department of Economics, Yale University)
Richard McLean () (Department of Economics, Rutgers University)
Andrew Postlewaite () (Department of Economics, University of Pennsylvania)

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Abstract

Conflicts of interest arise between a decision maker and agents who have information pertinent to the problem because of differences in their preferences over outcomes. We show how the decision maker can extract the information by distorting the decisions that will be taken, and show that only slight distortions will be necessary when agents are informationally small. We further show that as the number of informed agents becomes large the necessary distortion goes to zero. We argue that the particular mechanisms analyzed are substantially less demanding informationally than those typically employed in implementation and virtual implementation. In particular, the equilibria we analyze are conditionally dominant strategy in a precise sense. Further, the mechanisms are immune to manipulation by small groups of agents.

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Publisher Info
Paper provided by Penn Institute for Economic Research, Department of Economics, University of Pennsylvania in its series PIER Working Paper Archive with number 05-016.

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Length: 41 pages
Date of creation: 01 Apr 2005
Date of revision:
Handle: RePEc:pen:papers:05-016

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Related research
Keywords: Information aggregation; Asymmetric information; Cheap talk; Experts;

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Find related papers by JEL classification:
D7 - Microeconomics - - Analysis of Collective Decision-Making
D8 - Microeconomics - - Information, Knowledge, and Uncertainty

This paper has been announced in the following NEP Reports:

References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Wolinsky, Asher, 2002. "Eliciting information from multiple experts," Games and Economic Behavior, Elsevier, vol. 41(1), pages 141-160, October. [Downloadable!] (restricted)
  2. Matsushima, Hitoshi, 1988. "A new approach to the implementation problem," Journal of Economic Theory, Elsevier, vol. 45(1), pages 128-144, June. [Downloadable!] (restricted)
  3. Postlewaite, Andrew & Schmeidler, David, 1986. "Implementation in differential information economies," Journal of Economic Theory, Elsevier, vol. 39(1), pages 14-33, June. [Downloadable!] (restricted)
  4. Richard McLean & Andrew Postlewaite, 2002. "Informational Size and Efficient Auctions," PIER Working Paper Archive 03-011, Penn Institute for Economic Research, Department of Economics, University of Pennsylvania, revised 13 Apr 2003. [Downloadable!]
    Other versions:
  5. Serrano, Roberto & Vohra, Rajiv, 2005. "A characterization of virtual Bayesian implementation," Games and Economic Behavior, Elsevier, vol. 50(2), pages 312-331, February. [Downloadable!] (restricted)
    Other versions:
  6. Marco Battaglini, 2002. "Multiple Referrals and Multidimensional Cheap Talk," Econometrica, Econometric Society, vol. 70(4), pages 1379-1401, July. [Downloadable!] (restricted)
    Other versions:
  7. Marco Ottaviani & Peter Sorensen, 1999. "Professional Advice," Game Theory and Information 9906003, EconWPA. [Downloadable!]
    Other versions:
  8. Timothy Feddersen & Wolfgang Pesendorfer, 1996. "Convicting the Innocent: The Inferiority of Unanimous Jury Verdicts," Discussion Papers 1170, Northwestern University, Center for Mathematical Studies in Economics and Management Science. [Downloadable!]
  9. Cremer, Jacques & McLean, Richard P, 1985. "Optimal Selling Strategies under Uncertainty for a Discriminating Monopolist When Demands Are Interdependent," Econometrica, Econometric Society, vol. 53(2), pages 345-61, March. [Downloadable!] (restricted)
  10. Richard McLean & Andrew Postlewaite, 2002. "Informational Size and Incentive Compatibility," Econometrica, Econometric Society, vol. 70(6), pages 2421-2453, November. [Downloadable!] (restricted)
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  11. Marco Ottaviani & Peter Norman Sorensen, 2006. "Reputational Cheap Talk," RAND Journal of Economics, The RAND Corporation, vol. 37(1), pages 155-175, Spring.
  12. Matthew O. Jackson, 2001. "A crash course in implementation theory," Social Choice and Welfare, Springer, vol. 18(4), pages 655-708. [Downloadable!] (restricted)
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  13. Richard P. McLean & Andrew Postlewaite, 2006. "Implementation with Interdependent Valuations," Levine's Bibliography 122247000000001242, UCLA Department of Economics. [Downloadable!]
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  14. Abreu, Dilip & Sen, Arunava, 1991. "Virtual Implementation in Nash Equilibrium," Econometrica, Econometric Society, vol. 59(4), pages 997-1021, July. [Downloadable!] (restricted)
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  15. Crawford, Vincent P & Sobel, Joel, 1982. "Strategic Information Transmission," Econometrica, Econometric Society, vol. 50(6), pages 1431-51, November. [Downloadable!] (restricted)
  16. Timothy Feddersen & Wolfgang Pesendorfer, 1994. "Voting Behavior and Information Aggregation in Elections with Private Information," Discussion Papers 1117, Northwestern University, Center for Mathematical Studies in Economics and Management Science. [Downloadable!]
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  17. Austen-Smith David, 1993. "Interested Experts and Policy Advice: Multiple Referrals under Open Rule," Games and Economic Behavior, Elsevier, vol. 5(1), pages 3-43, January. [Downloadable!] (restricted)
Full references

Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Dezsö Szalay & Ramon Arean, 2005. "Communicating with a Team of Experts," Cahiers de Recherches Economiques du Département d'Econométrie et d'Economie politique (DEEP) 05.12, Université de Lausanne, Faculté des HEC, DEEP. [Downloadable!]
  2. Casamatta, Catherine & Haritchabalet, Carole, 2007. "Experience, Screening and Syndication in Venture Capital Investments," IDEI Working Papers 443, Institut d'Économie Industrielle (IDEI), Toulouse. [Downloadable!]
    Other versions:
  3. Luis C. Corchon, 2007. "The theory of implementation : what did we learn?," Economics Working Papers we081207, Universidad Carlos III, Departamento de Economía. [Downloadable!]
  4. Junichiro Ishida & Takashi Shimizu, 2009. "Cheap Talk with an Informed Receiver," ISER Discussion Paper 0746, Institute of Social and Economic Research, Osaka University. [Downloadable!]
  5. Elisabeth Schulte, 2006. "Information Aggregation and Preference Heterogeneity in Committees," JEPS Working Papers 06-003, JEPS. [Downloadable!]
  6. Tilman Klumpp, 2007. "Communication in financial markets with several informed traders," Economic Theory, Springer, vol. 33(3), pages 437-456, December. [Downloadable!] (restricted)
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