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An experimental study of jury deliberation

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  • Jacob K. Goeree
  • Leeat Yariv

Abstract

We study the effects of deliberation on collective decisions. In a series of experiments, we vary groups' preference distributions (between common and conflicting interests) and the institutions by which decisions are reached (simple majority, two-thirds majority, and unanimity). When deliberation is prohibited, different institutions generate significantly different outcomes, tracking the theoretical comparative statics. Deliberation, however, significantly diminishes institutional differences and uniformly improves efficiency. Furthermore, communication protocols exhibit an array of stable attributes: messages are public, consistently reveal private information, provide a good predictor for ultimate group choices, and follow particular (endogenous) sequencing.

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Bibliographic Info

Paper provided by Institute for Empirical Research in Economics - University of Zurich in its series IEW - Working Papers with number 438.

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Date of creation: Sep 2009
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Handle: RePEc:zur:iewwpx:438

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Keywords: Jury decision making; deliberative voting; strategic voting;

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  1. David J. Cooper & John H. Kagel, 2005. "Are Two Heads Better Than One? Team versus Individual Play in Signaling Games," American Economic Review, American Economic Association, vol. 95(3), pages 477-509, June.
  2. Timothy Feddersen & Wolfgang Pesendorfer, 1997. "Voting Behavior and Information Aggregation in Elections With Private Information," Levine's Working Paper Archive 1560, David K. Levine.
  3. 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.
  4. V. Crawford & J. Sobel, 2010. "Strategic Information Transmission," Levine's Working Paper Archive 544, David K. Levine.
  5. Dino Gerardi & Leeat Yariv, 2007. "Information Acquisition in Committees," Cowles Foundation Discussion Papers 1411R, Cowles Foundation for Research in Economics, Yale University.
  6. Gerardi, Dino & Yariv, Leeat, 2007. "Deliberative voting," Journal of Economic Theory, Elsevier, vol. 134(1), pages 317-338, May.
  7. Meirowitz, Adam, 2006. "Designing Institutions to Aggregate Preferences and Information," International Quarterly Journal of Political Science, now publishers, vol. 1(4), pages 373-392, October.
  8. Roger B. Myerson, 1994. "Extended Poisson Games and the Condorcet Jury Theorem," Discussion Papers 1103, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  9. Cai, Hongbin & Wang, Joseph Tao-Yi, 2006. "Overcommunication in strategic information transmission games," Games and Economic Behavior, Elsevier, vol. 56(1), pages 7-36, July.
  10. Bottom, William P & Ladha, Krishna & Miller, Gary J, 2002. " Propagation of Individual Bias through Group Judgment: Error in the Treatment of Asymmetrically Informative Signals," Journal of Risk and Uncertainty, Springer, vol. 25(2), pages 147-63, September.
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