Gender Quotas in South America’s Big Three paints a richly detailed portrait of gender quotas at the national and subnational levels in Argentina, Brazil, and Peru, describing their adoption and implementation. . . . Overall, Gender Quotasprovides a useful overview of the literature on quotas for readers unfamiliar with the topic; it offers a rich description of the electoral systems and gender quotas used in Argentina, Brazil, and Peru; and empirically documents the numbers of women in positions of political influence across these countries.