From locality to continent: A comment on the generalization of an experimental study

► Kocher et al. (2008) find that conditional willingness to cooperate is significantly stronger at a U.S. research site, Appalachian State University, than at sites in Europe and Asia. ► I find that the willingness at Brown University, in Rhode Island, is not significantly different from that in Europe and Asia in Kocher et al. (2008). ► Clear evidence on significantly different demographic statistics between these two U.S. research sites is provided. ► This implies that in empirical studies we need exercise care to generalize from results of a specific study to a conclusion.