Conformity in the lab

We use a revealed preference approach to disentangle conformity, an intrinsic taste to follow others, from information driven herding. We provide observations from a series of sequential decision making experiments in which subjects choose the type of information they observe before making their decision. Namely, subjects choose between observing a private (statistically informative) signal or the history of play of predecessors who have not chosen a private signal (i.e., a statistically uninformative word-of-mouth signal). In our setup, subjects choose the statistically uninformative social signal 34% of the time and, of those, 88% follow their observed predecessors' actions. When allowing for payo externalities by paying subjects according to the collective action chosen by majority rule, the results amplify and the social signal is chosen in 51% of all cases, and 59% of those who pick the social signal follow the majority choice. The results from the majority treatment demonstrate that conformist behavior is not driven by inequality aversion, nor by strategic voting behavior in which voters balance others who are uninformed. Raising the stakes ve-fold does not eliminate conformist behavior; in both treatments, the social signal is chosen nearly 50% of the time. Individual level analysis yields the identi cation of rules of thumb subjects use in making their decisions. JEL classi cation: C91, D70, D80