Groups, companies, and organizations identify themselves via symbols. Symbols have the potential to create group identity and at the same time create group boundaries, thus allowing for achieving the benefits of cooperation by ingroup members. We use a laboratory experiment to study the role of...

Both the law and culture make a central distinction between acts of commission that overturn the status quo and acts of omission that uphold it. In everyday life acts of commission often elicit stronger reciprocal responses than do acts of omission. In this paper we compare reciprocal responses...

Employing a two-by-two factorial design that manipulates whether dictator groups are single or mixed-sex and whether procedures are single or double-blind, we examine gender effects in a standard dictator game. No gender effect was found in any of the experimental treatments. Moreover, neither...