This paper focuses on decisions under ambiguity. Participants in a laboratory experiment made decisions in three different settings: (a) individually, (b) individually after discussing the decisions with others, and (c) in groups of three. We show that groups are more likely to make...

A vast literature shows that individuals frequently violate normative principles in reasoning. In evaluating the relevance of these findings for psychology, economics, and related disciplines, it is natural to ask whether reasoning errors reflect random aberrations or systematic biases. One...

A vast literature shows that individuals frequently fail to identify the normative solutions in logical reasoning tasks. Much attention has been devoted to the study of these deviations at the individual level; less eVort was exerted to investigate whether institutional settings might facilitate...

The Recognition Heuristic (Gigerenzer \& Goldstein, 1996; Goldstein \& Gigerenzer, 2002) makes the counter-intuitive prediction that a decision maker utilizing less information may do as well as, or outperform, an idealized decision maker utilizing more information. We lay a theoretical foundation...

We study the impact of team decision making on market behavior and its consequences for subsequent individual performance in the Wason selection task, the single-most studied reasoning task. We reformulated the task in terms of "assets" in a market context. Teams of traders learn the task’s...