Preferences and beliefs in intergroup conflict
Participation in intergroup conflict is often framed as a matter of ‘in-group love’ or ‘out-group hate’. Indeed, theoretical accounts including social identity theory and parochial altruism suggest that such group-based preferences are inextricably linked. According to this view, individuals engage in intergroup conflict, including harmful behaviour towards out-group members, in order to improve the relative standing of their in-group. However, individuals may also engage in intergroup conflict to reciprocate beneficial behaviour from their in-group members or harmful behaviour from out-group members. We elicited both preferences towards in-group and out- group members and beliefs about in-group and out-group members’ behaviours prior to playing an experimental conflict game with natural groups (N = 973). In this game, individuals could engage in costly behaviour to either benefit their in-group (without consequences to the out-group) or to both benefit their in-group and harm the out-group. In this setting, both preferences and beliefs contributed to explaining in-group beneficial and out-group harming behaviour. However, beliefs played an overall stronger role than preferences in explaining behaviour. This suggests that participation in intergroup conflict is better explained by positive and negative reciprocity than purely by group-based preferences.