This paper tests social identity theory with respect to individuals' self-identification behavior. We report results from a laboratory experiment in which subjects choose their group membership, which is interpreted as decision to identify with the respective group. Inducing a trade-off between...

This article develops a socio-economic model that analyzes the doping decision of professional athletes. In their decision to use performance enhancing drugs athletes do not only evaluate the costs and bene?ts (in terms of potential rank improvement). They also take into account peer-group...

We interpret the psychology literature on social identity and examine its implications in a population partially composed of such agents. We model a population of agents from two exogenous and well defined social groups. Agents are randomly matched to play a reduced form bargaining game. We show...