Existing studies on social preferences and political distance demonstrates that partisanship conditions interpersonal trust, a basic component of cooperation. However, experimental evidence typically relies on narrow population and do not evaluate this effect including other sources of division. To investigate this relationship, we report on an on-line survey-experiment involving multiple trust games with varying information on the political identity of the subjects, assessing the relative importance of partisanship, social class, regional identities and their ideology. The research is carried out in Spain, a country where deep political divisions have become recently more visible. We are going to observe whether citizens’ trust is affected by group identity and whether people tend to favor in-group members over the out-group. Finally, the paper explores the conditions under which this effect is reinforced. The attention will be concentrated on the strength of the identities, while controlling for other potential factors such as political sophistication.
