Evidence from the use of communal lands in southern Namibia suggests that there is a higher tendency towards anti-social behaviour and conflict amongst groups who were exposed to higher levels of resource scarcity than others.
Prediger et al (2014) Journal of Public Economics
Areas in Croatia reached by Serbian public radio have a higher tendency to vote for extreme nationalist parties. Offensive anti-Serbian graffiti is also more common.
Della Vigna et al. (2014) American Economic Journal: Applied Economics
Societies composed of many small ethnic groups will tend to have less social tension within each group but higher levels of tension between groups, compared to more homogeneous societies. Also, social mobility will make social tensions less likely across class than across ethnic groups.
Rohner (2011) Journal of Development Economics