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Group Polarization in a Model of Information Aggregation

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  • Nicolas Roux
  • Joel Sobel

Abstract

Experiments identify the empirical regularity that groups tend to make decisions that are more extreme, but in the same direction as the tendency of individual members of the group. We present a model of information aggregation consistent with these findings. We assume individuals and groups are rational decision makers facing monotone statistical decision problems where groups and individuals have common preferences, but groups have superior information. We provide conditions under which the distribution of the optimal actions of the group is more variable than the distribution of actions taken by individuals. (JEL D71, D83)

Suggested Citation

  • Nicolas Roux & Joel Sobel, 2015. "Group Polarization in a Model of Information Aggregation," American Economic Journal: Microeconomics, American Economic Association, vol. 7(4), pages 202-232, November.
    • Handle: RePEc:aea:aejmic:v:7:y:2015:i:4:p:202-32
    Note: DOI: 10.1257/mic.20140252
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    References listed on IDEAS

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    1. ,, 2014. "On the relationship between individual and group decisions," Theoretical Economics, Econometric Society, vol. 9(1), January.
    2. Hong, Lu & Page, Scott, 2009. "Interpreted and generated signals," Journal of Economic Theory, Elsevier, vol. 144(5), pages 2174-2196, September.
    3. Joel Sobel, 2014. "On the relationship between individual and group decisions," Levine's Working Paper Archive 786969000000000950, David K. Levine.
    4. Kaas, Rob & Dannenburg, Dennis & Goovaerts, Marc, 1997. "Exact Credibility for Weighted Observations," ASTIN Bulletin, Cambridge University Press, vol. 27(2), pages 287-295, November.
    5. Levy, Haim & Kroll, Yoram, 1978. "Ordering Uncertain Options with Borrowing and Lending," Journal of Finance, American Finance Association, vol. 33(2), pages 553-574, May.
    6. Robert F. Bordley, 1982. "A Multiplicative Formula for Aggregating Probability Assessments," Management Science, INFORMS, vol. 28(10), pages 1137-1148, October.
    7. Attila Ambrus & Ben Greiner & Parag Pathak, 2013. "How individual preferences get aggregated in groups - An experimental study," Discussion Papers 2013-24, School of Economics, The University of New South Wales.
    8. Kfir Eliaz & Debraj Ray & Ronny Razin, 2006. "Choice Shifts in Groups: A Decision-Theoretic Basis," American Economic Review, American Economic Association, vol. 96(4), pages 1321-1332, September.
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    Cited by:

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    2. Axel Ockenfels & Dirk Sliwka & Peter Werner, 2024. "Multi-rater Performance Evaluations and Incentives," ECONtribute Discussion Papers Series 307, University of Bonn and University of Cologne, Germany.
    3. David Dillenberger & Colin Raymond, 2016. "Group-Shift and the Consensus Effect, Second Version," PIER Working Paper Archive 16-015, Penn Institute for Economic Research, Department of Economics, University of Pennsylvania, revised 30 Sep 2016.
    4. Athey, Susan & Levin, Jonathan, 2018. "The value of information in monotone decision problems," Research in Economics, Elsevier, vol. 72(1), pages 101-116.
    5. Conde-Ruiz, J. Ignacio & Ganuza, Juan José & Profeta, Paola, 2022. "Statistical discrimination and committees," European Economic Review, Elsevier, vol. 141(C).
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    9. Honryo, Takakazu, 2018. "Risky shifts as multi-sender signaling," Journal of Economic Theory, Elsevier, vol. 174(C), pages 273-287.

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    More about this item

    JEL classification:

    • D71 - Microeconomics - - Analysis of Collective Decision-Making - - - Social Choice; Clubs; Committees; Associations
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness

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