Social comparisons are an essential source of information about the self. Research in social psychology has shown individual variation in the tendency toward comparison with other people's opinions and abilities, raising the question of whether social comparisons are driven by psychological...

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 benefits (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...

In this paper, we explore the effect of identity salience on behavior in a simple social interaction. Specifically, we compare behavior in a ultimatum game across three treatments: priming subjects with a shared identity, priming subjects with an identity distinct from those with whom they will...

Consider a situation where person A undertakes a costly action that benefits person B. This behavior seems altruistic. However, if A expects a reward in return from B, then A's action may be motivated by the expected rewards rather than by pure altruism. The question we address in this...