The Evolution of Human Societies: From Foraging Group to Agrarian State, Second EditionBy combining an original thesis and a representative body of ethnographic data, this ambitious work seeks to describe and explain the growth in complexity of human societies. Its emphasis is on the causes, mechanisms, and patterns of cultural evolution, which the authors explain in terms of a coherent theory of political economy defined as the mobilization and exchange of goods and services between families. The authors show that the interconnected