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A brief note on a further refinement of the Condorcet Jury Theorem for heterogeneous groups

Kanazawa, Satoshi (1998) A brief note on a further refinement of the Condorcet Jury Theorem for heterogeneous groups. Mathematical Social Sciences, 35 (1). pp. 69-73. ISSN 0165-4896

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Abstract

I extend Boland's (1989) work on the Condorcet's Jury Theorem (CJT) for heterogeneous groups. I demonstrate that, as long as CJT holds (in that the mean individual competence ≥(1/2)+(1/2n)), heterogeneous groups are better at making the correct decision than homogeneous groups for any given level of mean competence. I also extend CJT to collective decision rules other than simple majority, and show that CJT holds for groups with supermajority decision rules if the mean individual competence is at least (π(n+1)/n) (where π=required majority).

Item Type: Article
Official URL: http://www.elsevier.com/wps/find/journaldescriptio...
Additional Information: © 1998 Elsevier
Library of Congress subject classification: H Social Sciences > HB Economic Theory
Sets: Research centres and groups > Managerial Economics and Strategy Group
Departments > Management
Collections > Economists Online
Rights: http://www.lse.ac.uk/library/usingTheLibrary/academicSupport/OA/depositYourResearch.aspx
Date Deposited: 08 Mar 2010 11:11
URL: http://eprints.lse.ac.uk/27291/

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