Seminario CEA-MIPP - Miercoles 18/06/2025, 12:30 HRS - Sala de Consejo, piso 4, Beauchef 851 - “A theory of identity fragmentation" - Tomás Rodríguez (Los Andes, Colombia)

Tema: «A theory of identity fragmentation«

Presenta: Tomás Rodríguez (Los Andes, Colombia)

The communications revolution of the late 1990s–2020s expanded the ability of middle-sized coalitions to overcome collective-action problems, increasing their relative value. This shift has two opposing implications for large coalitions: it can destabilize them by making defections easier, yet it can also foster new middle-sized groups that serve as stepping-stones toward larger alliances. Building on the dynamic network framework of Jackson and Watts (2002), we introduce a model of coalition formation with persistent shocks to the value of middle-sized coalitions. We derive necessary and sufficient conditions for when large-coalition structures remain stable in the long run and when they erode. The analysis explains why many democracies have experienced rising political fragmentation after the communications revolution.

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