A relevance, distinctiveness and plausibility (RDP) analysis is a conceptual framework that can be used to identify when potential confounds are a problem for interpreting experimental results. We illustrate this analysis using the creation or enhancement of natural group identity by the means...

We present the results of an experiment that attempts to measure the impact of majority and minority groups, and high status and low status groups, on well-being, cooperation and social capital. In the experiment, group membership is induced artificially, subjects interact with insiders and...

We study an economic setting where, due to payoff externalities such as peer effects or network externalities, the enthusiasm of the few entraps others to join an activity or club. Our experimental results largely support the model and its theoretical prediction of entrapment. Subjects choose to...