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Group Decision-Making in the Shadow of Disagreement

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Author Info
Debraj Ray (Department of Economics, New York University and Instituto de Análisis Económico (CSIC))
Kfir Eliaz (Department of Economics, New York University)
Ronny Razin (Department of Economics, New York University)

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Abstract

A model of group decision-making is studied, in which one of two alternatives must be chosen. While group members differ in their valuations of the alternatives, everybody prefers some alternative to disagreement. Our model is distinguished by three features: private information regarding valuations, varying intensities in the preference for one out-come over the other, and the option to declare neutrality in order to avoid disagreement. We uncover a variant on the “tyranny of the majority": there is always an equilibrium in which the majority is more aggressive in pushing its alternative, thus enforcing their will via both numbers and voice. However, under very general conditions an aggressive minority equilibrium inevitably makes an appearance, provided that the group is large enough. This equilibrium displays a “tyranny of the minority": it is always true that the increased aggression of the minority more than compensates for smaller number, leading to the minority outcome being implemented with larger probability than the majority alternative. In all cases the option to remain neutral ensures that the probability of disagreement is bounded away from one (as group size changes), regardless of the supermajority value needed for agreement, as long as it is not unanimity.

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Paper provided by Fondazione Eni Enrico Mattei in its series Working Papers with number 2004.83.

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Date of creation: May 2004
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Handle: RePEc:fem:femwpa:2004.83

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Related research
Keywords: Collective decision-making; Groups; Disagreements; Decision rules;

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Find related papers by JEL classification:
D71 - Microeconomics - - Analysis of Collective Decision-Making - - - Social Choice; Clubs; Committees; Associations
D78 - Microeconomics - - Analysis of Collective Decision-Making - - - Positive Analysis of Policy-Making and Implementation
D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information

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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. Jackson, Matthew O. & Sonnenschein, Hugo F., 2003. "The Linking of Collective Decisions and Efficiency," Working Papers 1159, California Institute of Technology, Division of the Humanities and Social Sciences. [Downloadable!]
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  2. Ponsati, Clara & Sakovics, Jozsef, 1996. "Multiperson Bargaining over Two Alternatives," Games and Economic Behavior, Elsevier, vol. 12(2), pages 226-244, February. [Downloadable!] (restricted)
  3. Philipson, Tomas J & Snyder, James M, Jr, 1996. " Equilibrium and Efficiency in an Organized Vote Market," Public Choice, Springer, vol. 89(3-4), pages 245-65, December.
  4. Casella, Alessandra, 2002. "Storable Votes," CEPR Discussion Papers 3508, C.E.P.R. Discussion Papers. [Downloadable!] (restricted)
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  5. Kahneman, Daniel & Schkade, David & Sunstein, Cass R, 1998. "Shared Outrage and Erratic Awards: The Psychology of Punitive Damages," Journal of Risk and Uncertainty, Springer, vol. 16(1), pages 49-86, April. [Downloadable!] (restricted)
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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. Rafael Hortala-Vallve, 2007. "Inefficiencies on Linking Decisions," Economics Series Working Papers 321, University of Oxford, Department of Economics. [Downloadable!]
  2. Hitoshi Matsushima & Koichi Miyazaki & Nobuyuki Yagi, 2006. "Role of Linking Mechanisms in Multitask Agency with Hidden Information," CIRJE F-Series CIRJE-F-401, CIRJE, Faculty of Economics, University of Tokyo. [Downloadable!]
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