1. On the relevance of identities, communities, groups, and networks to the economics of poverty alleviation / Christopher B. Barrett -- 2. Toward an economic theory of dysfunctional identity / Hanming Fang and Glenn C. Loury -- 3. Polarization : concepts, measurement, estimation / Jean-Yves Duclos, Joan Esteban and Debraj Ray -- 4. Evolutionary equilibrium with forward-looking players / Lawrence E. Blume -- 5. Is inequality an evolutionary universal? / Samuel Bowles -- 6. Bridging communal divides : separation, patronage, integration / Indraneel Dasgupta and Ravi Kanbur -- 7. The extended family system and market interactions / Karla Hoff and Arijit Sen -- 8. Social divisions within schools : how school policies can affect students' identities and educational choices / George A. Akerlof and Rachel E. Kranton -- 9. Smallholder identities and social networks : the challenge of improving productivity and welfare / Christopher B. Barrett -- 10. Social networks in Ghana / Christopher R. Udry and Timothy G. Conley -- 11. Coping with disaster : morals, markets, and mutual insurance : using economic experiments to study recovery from Hurricane Mitch / Michael R. Carter and Marco Castillo -- 12. The role of ethnicity and networks in agricultural trade : evidence from Africa / Marcel Fafchamps -- 13. Altruism, household co-residence and women's health investment in rural Bangladesh / Andrew D. Foster -- 14. Self-help groups and income generation in the informal settlements of Nairobi / Eliana La Ferrara -- 15. Community ties and land inheritance in the context of rising outside opportunities : evidence from the Peruvian highlands / Tatiana Goetghebuer and Jean-Philippe Platteau.