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Aggregation of expert opinions

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  • Gerardi, Dino
  • McLean, Richard
  • Postlewaite, Andrew

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 investigate how the decision maker can extract the information by distorting the decisions that will be taken. We show that only slight distortions will be necessary when agents' signals are sufficiently accurate or when the number of informed agents becomes large. We argue that the particular mechanisms analyzed are substantially less demanding informationally than those typically employed in implementation and virtual implementation. Further, the mechanisms are immune to manipulation by small groups of agents.

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Bibliographic Info

Article provided by Elsevier in its journal Games and Economic Behavior.

Volume (Year): 65 (2009)
Issue (Month): 2 (March)
Pages: 339-371

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Handle: RePEc:eee:gamebe:v:65:y:2009:i:2:p:339-371

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Web page: http://www.elsevier.com/locate/inca/622836

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References

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  1. Crawford, Vincent P & Sobel, Joel, 1982. "Strategic Information Transmission," Econometrica, Econometric Society, vol. 50(6), pages 1431-51, November.
  2. Battaglini Marco, 2004. "Policy Advice with Imperfectly Informed Experts," The B.E. Journal of Theoretical Economics, De Gruyter, vol. 4(1), pages 1-34, April.
  3. Richard McLean & Andrew Postlewaite, . "Informational Size and Incentive Compatibility," Penn CARESS Working Papers 7f6ff09d59945e06909ce4fa4, Penn Economics Department.
  4. John Duggan, 1997. "Virtual Bayesian Implementation," Econometrica, Econometric Society, vol. 65(5), pages 1175-1200, September.
  5. Matsushima, Hitoshi, 1988. "A new approach to the implementation problem," Journal of Economic Theory, Elsevier, vol. 45(1), pages 128-144, June.
  6. Marco Battaglini, 2002. "Multiple Referrals and Multidimensional Cheap Talk," Econometrica, Econometric Society, vol. 70(4), pages 1379-1401, July.
  7. Abreu, Dilip & Sen, Arunava, 1991. "Virtual Implementation in Nash Equilibrium," Econometrica, Econometric Society, vol. 59(4), pages 997-1021, July.
  8. Timothy Feddersen & Wolfgang Pesendorfer, 1997. "Voting Behavior and Information Aggregation in Elections With Private Information," Levine's Working Paper Archive 1560, David K. Levine.
  9. Roberto Serrano & Rajiv Vohra, 2002. "A Characterization of Virtual Bayesian Implementation," Working Papers 2002-11, Brown University, Department of Economics.
  10. Jackson, Matthew O., 1999. "A Crash Course in Implementation Theory," Working Papers 1076, California Institute of Technology, Division of the Humanities and Social Sciences.
  11. Richard McLean & Andrew Postlewaite, 2004. "Informational Size and Efficient Auctions," Review of Economic Studies, Oxford University Press, vol. 71(3), pages 809-827.
  12. Matsushima Hitoshi, 1993. "Bayesian Monotonicity with Side Payments," Journal of Economic Theory, Elsevier, vol. 59(1), pages 107-121, February.
  13. Ottaviani, Marco & Sorensen, Peter Norman, 2006. "Professional advice," Journal of Economic Theory, Elsevier, vol. 126(1), pages 120-142, January.
  14. Marco Ottaviani & Peter Norman Sørensen, 2006. "Reputational cheap talk," RAND Journal of Economics, RAND Corporation, vol. 37(1), pages 155-175, 03.
  15. 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.
  16. Richard P. McLean & Andrew Postlewaite, 2006. "Implementation with Interdependent Valuations," PIER Working Paper Archive 06-007, Penn Institute for Economic Research, Department of Economics, University of Pennsylvania.
  17. Gul, Faruk & Postlewaite, Andrew, 1992. "Asymptotic Efficiency in Large Exchange Economies with Asymmetric Information," Econometrica, Econometric Society, vol. 60(6), pages 1273-92, November.
  18. 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.
  19. 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.
  20. Wolinsky, Asher, 2002. "Eliciting information from multiple experts," Games and Economic Behavior, Elsevier, vol. 41(1), pages 141-160, October.
  21. Postlewaite, Andrew & Schmeidler, David, 1986. "Implementation in differential information economies," Journal of Economic Theory, Elsevier, vol. 39(1), pages 14-33, June.
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Citations

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Cited by:
  1. Elisabeth Schulte, 2010. "Information aggregation and preference heterogeneity in committees," Theory and Decision, Springer, vol. 69(1), pages 97-118, July.
  2. Pablo Amorós, 2010. "Picking the Winners," Working Papers 2010-06, Universidad de Málaga, Department of Economic Theory, Málaga Economic Theory Research Center.
  3. Junichiro Ishida & Takashi Shimizu, 2009. "Cheap Talk with an Informed Receiver," ISER Discussion Paper 0746, Institute of Social and Economic Research, Osaka University.
  4. Luis C. Corchon, 2007. "The theory of implementation : what did we learn?," Economics Working Papers we081207, Universidad Carlos III, Departamento de Economía.
  5. Inga Deimen & Felix Ketelaar & Mark T. Le Quement, 2013. "Consistency and Communication in Committees," Bonn Econ Discussion Papers bgse02_2013, University of Bonn, Germany.
  6. Jackson, Matthew O. & Tan, Xu, 2013. "Deliberation, disclosure of information, and voting," Journal of Economic Theory, Elsevier, vol. 148(1), pages 2-30.
  7. Casamatta, Catherine & Haritchabalet, Carole, 2007. "Experience, Screening and Syndication in Venture Capital Investments," IDEI Working Papers 443, Institut d'Économie Industrielle (IDEI), Toulouse.
  8. Hahn, Robert W. & Lien, Don & Tetlock, Paul C., 2005. "Designing Information Markets for Decision Making," Working paper 426, Regulation2point0.
  9. Elisabeth Schulte, 2012. "Communication in committees: who should listen?," Public Choice, Springer, vol. 150(1), pages 97-117, January.
  10. Tilman Klumpp, 2007. "Communication in financial markets with several informed traders," Economic Theory, Springer, vol. 33(3), pages 437-456, December.
  11. 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.

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