Contents: 1 On the relevance of identities, communities, groups, and networks to the economics of poverty alleviation. 2 Toward an economic theory of dysfunctional identity. 3 Polarization: concepts, measurement, estimation. 4 Evolutionary equilibrium with forward-looking players. 5 Is inequality an evolutionary universal? 6 Bridging communal divides: separation, patronage, integration. 7 The extended family system and market interactions. 8 Social divisions within schools: how school policies can affect students' identities and educational choices. 9 Smallholder identities and social networks: the challenge of improving productivity and welfare. 10 Social networks in Ghana. 11 Coping with disaster: morals, markets, and mutual insurance - using economic experiments to study recovery from Hurricane Mitch. 12 The role of ethnicity and networks in agricultural trade: evidence from Africa. 13 Altruism, household co-residence and women's health investment in rural Bangladesh. 14 Self-help groups and income generation in the informal settlements of Nairobi. 15 Community ties and land inheritance in the context of rising outside opportunities: evidence from the Peruvian Highlands.