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Comparing Group and Individual Choices under Risk and Ambiguity: An Experimental Study

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Abstract

In this paper, we build on the emerging literature on group decision-making to study the so-called ‘group shift’ effect, i.e., groups are less risk-averse than individuals. Our study complements past research in two ways. First, we study the group shift effect under two sources of uncertainty, namely risk where probabilities are known, and ambiguity where probabilities are imprecise. Second, we study the impact of the group decision rule (unanimity and majority) on group shift. Results from a lottery-choice experiment show a general tendency for the group shift effect, regardless of the decision rule. The group shift effect, however, is found to be significant only under risk in the unanimity treatment. Our study hence provides a clear test of the effect of the decision rule on the group shift effect under both risk and ambiguity.

Suggested Citation

  • Marielle Brunette & Laure Cabantous & Stéphane Couture, 2011. "Comparing Group and Individual Choices under Risk and Ambiguity: An Experimental Study," ICBBR Working Papers 15, International Centre for Behavioural Business Research.
  • Handle: RePEc:bbr:workpa:15
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    File URL: http://www.nottingham.ac.uk/~lizecon/RePEc/bbr/pdf/15.pdf
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    1. Carmela Di Mauro & Anna Maffioletti, 2004. "Attitudes to risk and attitudes to uncertainty: experimental evidence," Applied Economics, Taylor & Francis Journals, vol. 36(4), pages 357-372.
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    Cited by:

    1. Cavatorta, Elisa & Groom, Ben, 2014. "Preferences and Exposure to Shocks: Evidence from a Natural Experiment in Palestine," Annual Conference 2014 (Hamburg): Evidence-based Economic Policy 100592, Verein für Socialpolitik / German Economic Association.
    2. M. Vittoria Levati & Stefan Napel & Ivan Soraperra, 2017. "Collective Choices Under Ambiguity," Group Decision and Negotiation, Springer, vol. 26(1), pages 133-149, January.
    3. Tamar Kugler & Edgar E. Kausel & Martin G. Kocher, 2012. "Are Groups more Rational than Individuals? A Review of Interactive Decision Making in Groups," CESifo Working Paper Series 3701, CESifo Group Munich.

    More about this item

    Keywords

    Collective decision; Unanimity; Majority; Preferences; Risk; Ambiguity;

    JEL classification:

    • C91 - Mathematical and Quantitative Methods - - Design of Experiments - - - Laboratory, Individual Behavior
    • C92 - Mathematical and Quantitative Methods - - Design of Experiments - - - Laboratory, Group Behavior

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