One of the most fundamental questions for social scientists involves diffusion events; simply put, how do ideas spread and why do people embrace them? In Diffusion of Good Government: Social Sector Reforms in Brazil, Natasha Borges Sugiyama examines why innovations spread across political territories and what motivates politicians to adopt them. Sugiyama does so from the vantage point of Brazilian politics, a home to innovative social sector reforms intended to provide the poor with access to state resources. Since the late 1980s, the country has undergone major policy transformations as...