We study cooperation within and between groups in the laboratory, comparing treatments in which two groups have previously been (i) in conflict with one another, (ii) in conflict with a different group, or (iii) not previously exposed to conflict. We model conflict using an inter-group Tullock...

We study cooperation within and between groups in the laboratory, comparing treatments in which two groups have previously been (i) in conflict with one another, (ii) in conflict with a different group, or (iii) not previously exposed to conflict. We model conflict using an inter-group Tullock...

Trust is essential to many daily exchanges, wherein a trustor sometimes decides to be vulnerable to an individual or other times to a group. Although a trustor may trust an individual more or less than a group, this topic has been underexplored. We therefore examine whether people are more...

Contests are situations in which a set of agents compete for a valuable object, rent or award. The present paper analyzes difference-form group contests, that is, contests fought among groups and where their probability of victory depends on the difference of their effective efforts. First, we...

How is group conflict over a public-good prize affected when individuals are active members of multiple groups simultaneously? To investigate this question, I introduce a simple model of Tullock group contest: individuals are partitioned into two groups in two dimensions each, the group-level...

We present a framework of group cooperation and competition in which agents are concerned not only about their material payoffs but also about their psychological payoffs, derived from working with others per se. In such a framework, a group's psychological preferences serve to enhance the...