Decision process and preferences over risk under the “endogenous decision rule”: results from a group experiment


  • Andrea Morone
  • Simone Nuzzo Università degli Studi di Bari Aldo Moro, Italy
  • Tiziana Temerario Università degli Studi di Bari Aldo Moro, Italy



Recent literature on individual vs. group decision-making, in risky contexts, has brought about divergent results, mainly depending on the institutional rules through which groups take decisions. Some studies where group decisions relied on majority rule showed no appreciable difference between individuals and groups’ preferences, others where unanimity among group members was required found collective decisions to be less risk-averse than individual ones. We elicited groups’ preferences over risk using what we defined “endogenous-decision-rule”, i.e. leaving groups free to endogenously solve the potential disagreement among their members. Our results unambiguously show that individuals are more risk seeker than groups when facing gambles with positive expected payoff difference and more risk-averse in the opposite case.


Baker, R. J., S. K. Laury, and A. W. Williams. (2008). Comparing Small-Group and Individual Behavior in Lottery-Choice Experiments. Southern Economic Journal, 75 (2), 367–382

Brunette, M., L. Cabantous, and S. Couture. (2015). Are individuals more risk and ambiguity averse in a group environment or alone? Results from an experimental study. Theory and Decision, 78 (3), 357-376.

Fischbacher, U. (2007). z-Tree: Zurich toolbox for ready-made economic experiments. Experimental economics, 10 (2), 171-178.

Gastil, J. (1993). Democracy in small groups: Participation, decision making and communication, Philadelphia PA: NewSociety.

Harrison, G. W., L. Morten, E. Rutström, and M. Tarazona-Gomez. (2012). Preferences over Social Risk, Oxford Economic Papers, 65 (1), 25–46.

Holt, C. A. and S. K. Laury. (2002). Risk Aversion and Incentive Effects”, American Economic Review, 92 (5), 1644–1655.

Jacobson, S., and R. Petri. (2009). Learning from mistakes: What do inconsistent choices over risk tell us?. Journal of Risk and Uncertainty, 38 (2), 143-158.

Masclet, D., Y. Loheac, L. Denant-Boemont, and N. Colombier. (2009). Group and Individual Risk Preferences: a Lottery-Choice Experiment”. Journal of Economic Behavior and Organization, 70 (3), 470–484.

Shupp, R. S. and A. W. Williams. (2008). Risk preference differentials of small groups and individuals, The Economic Journal, 118 (525), 258–283.

Zhang, J., and M. Casari. (2012). How Groups Reach Agreement In Risky Choices: An Experiment", Economic Inquiry, 50 (2), 502–515.




How to Cite

Morone, A., Nuzzo, S. ., & Temerario, T. . (2021). Decision process and preferences over risk under the “endogenous decision rule”: results from a group experiment. Economics and Business Letters, 10(2), 107-115.