Arifovic, J., Hommes, C., Kopányi-Peuker, A. and Salle, I. (2023). Ten Isn’t Large! Group Size and Coordination in a Large-Scale Experiment American Economic Journal: Microeconomics, 15(1):580--617.
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Affiliated authors
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Publication year2023
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JournalAmerican Economic Journal: Microeconomics
We provide experimental evidence on coordination within large groups that could proxy the atomistic nature of real-world markets. We use a bank run game where the two pure-strategy equilibria can be ranked by payoff and risk dominance and a sequence of public announcements introduces stochastic sunspot equilibria. We find systematic group size effects that theory fails to predict. When the payoff-dominant strategy is risky enough, the behavior of small groups is uninformative of the behavior in large groups: unlike smaller groups of size ten, larger groups exclusively coordinate on the Pareto-inferior strategy and never coordinate on sunspots.