A survey of network formation models : stability and efficiency / Matthew O. Jackson -- Models of network formation in cooperative games / Anne van den Nouweland -- Farsighted stability in network formation / Frank H. Page, Jr., and Samir Kamat -- Learning in networks / Sanjeev Goyal -- Group formation : the interaction of increasing returns and preferences diversity / Gabrielle Demange -- Games and economies with near exhaustion of gains to scale / Alexander Kovalenkov and Myrna Wooders -- Coalitions and clubs : tiebout equilibrium in large economies / John Conley and Stefani Smith -- Secession-proof cost allocations and stable group structures in models of horizontal differentiation / Michel Le Breton and Shlomo Weber -- Political parties and coalition formation / Amrita Dhillon -- Power in the design of constitutional rules / Mika Widgren -- Group and network formation in industrial organization : a survey / Francis Block -- Institution design for managing global commons : lessons from coalition theory / Carlo Carraro -- Inequality and growth clubs / Fernando Jaramillo, Hubert Kempf, and Fabien Moizeau -- Informal insurance, enforcement constraints, and group formation / Garance Genicot and Debraj Ray -- Spontaneous market emergence and social networks / Marcel Fafchamps