cooperation systems that differ both in their level of in-group favoritism and in the tools that they employ to enforce … cooperation regimes. This paper uses an anthropological measure of the tightness of historical kinship systems to study the … structure of cooperation patterns and enforcement devices across historical ethnicities, contemporary countries, ethnicities …

cooperation systems that differ both in their level of in-group favoritism and in the tools that they employ to enforce … cooperation regimes. This paper uses an anthropological measure of the tightness of historical kinship systems to study the … structure of cooperation patterns and enforcement devices across historical ethnicities, contemporary countries, ethnicities …

to enforce cooperation within these different regimes. This paper develops a measure of the tightness of historical … readily support in-group members in need. This cooperation regime is enforced by tribalistic moral values, emotions of … social cooperation systems …