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Eliciting Information From Multiple Experts

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  • Asher Wolinsky

Abstract

A decision maker has to elicit information from informed experts regarding the desirability of a certain action from experts who share similar preferences which differ significantly from those of the decision maker. The question is how much information the decision maker can elicit, despite the difference in interests. The focus here is on ways in which the decision maker can take advantage of the multiplicity of experts. if the decision maker cannot commit to a mechanism and there is no communication among the experts, then no useful information is elicited from the experts in the equilibrium. If the experts can be partitioned into groups such that the members of each group can communicate with each other before they report their information to the decision maker, then more information can be elicited. Obviously, if all experts are allowed to communicate, they can be induced to reveal the relevant information, at least, when their aggregate information makes it desirable for them to undertake the project. The more interesting observation is that, if communication among the experts can be restricted to certain subsets, then even more information can be elicited. Finally, if the decision maker can commit to a mechanism, the information elicited in some cases is sufficient to implement the decision maker's best outcome in all but one state. All these observation make straightforward use of the idea that experts choose their report with the understanding that it matters only when they are pivotal.

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Paper provided by Northwestern University, Center for Mathematical Studies in Economics and Management Science in its series Discussion Papers with number 1277.

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Date of creation: Sep 1999
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Handle: RePEc:nwu:cmsems:1277

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  1. 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.
  2. FORGES, Françoise, . "Universal mechanisms," CORE Discussion Papers RP -914, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  3. Helmut Bester & Roland Strausz, . "Imperfect Commitment and the Revelation Principle," Papers 004, Departmental Working Papers.
  4. 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.
  5. 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.
  6. Marco Battaglini, 1999. "Multiple Referrals and Multidimensional Cheap Talk," Discussion Papers 1295, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  7. Crawford, Vincent P & Sobel, Joel, 1982. "Strategic Information Transmission," Econometrica, Econometric Society, vol. 50(6), pages 1431-51, November.
  8. Bester, Helmut & Strausz, Roland, 2001. "Contracting with Imperfect Commitment and the Revelation Principle: The Single Agent Case," Econometrica, Econometric Society, vol. 69(4), pages 1077-98, July.
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