In two experiments with the PDG we manipulated the Campbell (1958), or Wertheimer (1923), indices of entitativity (common fate, proximity, and similarity) to examine when a set of individuals interacts with another set of individuals in the competitive manner that is characteristic of...

An experiment tested whether groups lie more than individuals. Groups lied more than individuals when deception was guaranteed to maximize economic outcomes, but lied relatively less than individuals when honesty could be used strategically. These results suggest that groups are more strategic...

Existing trust research has disproportionately focused on what makes people more or less trusting, and has largely ignored the question of what makes people more or less trustworthy. In this investigation, we deepen our understanding of trustworthiness. Across six studies using economic games...

An observational, cross-cultural study and an experimental study assessed behaviors indicative of a moral code that condones, and even values hostility toward outgroups. The cross-cultural study, which used data from the Standard Cross-Cultural Sample (Murdock & White, 1969), found that for...