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Deliberation with Evidence

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  • MATHIS, JÉRÔME

Abstract

In committee deliberation, requiring a unanimous vote intuitively provides the strongest incentives for actors to share fully their opinions and private information. It is also believed that full revelation of (decision-relevant) information occurs when personal biases are made clear before deliberation. However, recent literature suggests that both intuitions are flawed. Austen-Smith and Feddersen propose a model in which the unanimity rule performs worse than other rules in promoting fully revealing deliberation, and uncertainty about individuals' preferences promotes full sharing of information. We extend this work by incorporating the possibility that individuals may provide verifiable evidence for their private information. Under this circumstance, we demonstrate that Austen-Smith and Feddersen's results are reversed. First, a unanimous voting rule performs better than any other, as unanimity is the only rule that always promotes fully revealing deliberation. Second, under fairly general conditions, uncertainty about individuals' preferences prevents full sharing of information.

Suggested Citation

  • Mathis, Jã‰Rã”Me, 2011. "Deliberation with Evidence," American Political Science Review, Cambridge University Press, vol. 105(3), pages 516-529, August.
    • Handle: RePEc:cup:apsrev:v:105:y:2011:i:03:p:516-529_00
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    Cited by:

    1. Jianan Wang, 2021. "Evidence and fully revealing deliberation with non-consequentialist jurors," Public Choice, Springer, vol. 189(3), pages 515-531, December.
    2. Jeanne Hagenbach & Frédéric Koessler & Eduardo Perez‐Richet, 2014. "Certifiable Pre‐Play Communication: Full Disclosure," Econometrica, Econometric Society, vol. 82(3), pages 1093-1131, May.
    3. Salvador Barberà & Antonio Nicolò, 2021. "Information disclosure with many alternatives," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 57(4), pages 851-873, November.
    4. Jérôme Mathis & Marcello Puca & Simone M. Sepe, 2021. "Deliberative Institutions and Optimality," CSEF Working Papers 614, Centre for Studies in Economics and Finance (CSEF), University of Naples, Italy, revised 09 Jun 2021.
    5. Volker Hahn, 2012. "On the Optimal Size of Committees of Experts," Working Paper Series of the Department of Economics, University of Konstanz 2012-24, Department of Economics, University of Konstanz.
    6. Ding, Huihui & Pivato, Marcus, 2021. "Deliberation and epistemic democracy," Journal of Economic Behavior & Organization, Elsevier, vol. 185(C), pages 138-167.
    7. Matthew Ryan, 2021. "Feddersen and Pesendorfer meet Ellsberg," Theory and Decision, Springer, vol. 90(3), pages 543-577, May.
    8. repec:hal:spmain:info:hdl:2441/4kpa2fek478tla1o86g6n9jb6v is not listed on IDEAS
    9. Jianan Wang, 2022. "Partially verifiable deliberation in voting," Public Choice, Springer, vol. 190(3), pages 457-481, March.
    10. Volker Hahn, 2017. "On the drawbacks of large committees," International Journal of Game Theory, Springer;Game Theory Society, vol. 46(2), pages 563-582, May.

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