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A Model Of Expertise

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Author Info
Vijay Krishna
John Morgan

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Abstract

We study a model in which perfectly informed experts offer advice to a decision maker whose actions affect the welfare of all. Experts are biased and thus may wish to pull the decision maker in different directions and to different degrees. When the decision maker consults only a single expert, the expert withholds substantial information from the decision maker. We ask whether this situation is improved by having the decision maker sequentially consult two experts. We first show that there is no perfect Bayesian equilibrium in which full revelation occurs. When both experts are biased in the same direction, it is never beneficial to consult both. In contrast, when experts are biased in opposite directions, it is always beneficial to consult both. Indeed, in this case full revelation may be induced in an extended debate by introducing the possibility of rebuttal. © 2001 the President and Fellows of Harvard College and the Massachusetts Institute of Technology

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Article provided by MIT Press in its journal The Quarterly Journal of Economics.

Volume (Year): 116 (2001)
Issue (Month): 2 (May)
Pages: 747-775
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Handle: RePEc:tpr:qjecon:v:116:y:2001:i:2:p:747-775

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  1. Steven A. Matthews & M. Okuno-Fujiwara & Andrew Postlewaite, 1990. "Refining Cheap-Talk Equilibria," Discussion Papers 892R, Northwestern University, Center for Mathematical Studies in Economics and Management Science. [Downloadable!]
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  2. Jerry R. Green & Nancy L. Stokey, 1980. "A Two-Person Game of Information Transmission," Discussion Papers 418, Northwestern University, Center for Mathematical Studies in Economics and Management Science. [Downloadable!]
  3. Farrell, Joseph & Rabin, Matthew, 1996. "Cheap Talk," Journal of Economic Perspectives, American Economic Association, vol. 10(3), pages 103-18, Summer. [Downloadable!] (restricted)
  4. Baliga, Sandeep & Corchon, Luis C. & Sjostrom, Tomas, 1997. "The Theory of Implementation When the Planner Is a Player," Journal of Economic Theory, Elsevier, vol. 77(1), pages 15-33, November. [Downloadable!] (restricted)
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  5. Sobel, Joel, 1985. "A Theory of Credibility," Review of Economic Studies, Blackwell Publishing, vol. 52(4), pages 557-73, October. [Downloadable!] (restricted)
  6. Ezra Friedman, 1998. "Public Debate Among Experts," Discussion Papers 1234, Northwestern University, Center for Mathematical Studies in Economics and Management Science. [Downloadable!]
  7. Jong-Il Kim & Lawrence J. Lau, 1996. "The sources of Asian Pacific economic growth," Canadian Journal of Economics, Canadian Economics Association, vol. 29(s1), pages 448-54, April. [Downloadable!] (restricted)
  8. Shin Hyun Song, 1994. "The Burden of Proof in a Game of Persuasion," Journal of Economic Theory, Elsevier, vol. 64(1), pages 253-264, October. [Downloadable!] (restricted)
  9. Abhijit Banerjee & Rohini Somanathan, 2001. "A Simple Model Of Voice," The Quarterly Journal of Economics, MIT Press, vol. 116(1), pages 189-227, February. [Downloadable!] (restricted)
  10. Morgan, J. & Stocken, P., 1998. "An Analysis of Stock Recommendations," Papers 204, Princeton, Woodrow Wilson School - Public and International Affairs.
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  11. Paul Milgrom & John Roberts, 1986. "Relying on the Information of Interested Parties," RAND Journal of Economics, The RAND Corporation, vol. 17(1), pages 18-32, Spring. [Downloadable!] (restricted)
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  12. Crawford, Vincent P & Sobel, Joel, 1982. "Strategic Information Transmission," Econometrica, Econometric Society, vol. 50(6), pages 1431-51, November. [Downloadable!] (restricted)
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