How to sustain cooperation is a key challenge for any society. Different social organizations have evolved in the course of history to cope with this challenge by relying on different combinations of external (formal and informal) enforcement institutions and intrinsic motivation. Some societies...

Over the last millennium, the clan and the city have been the locus of cooperation in China and Europe respectively. This paper examines - analytically, historically, and empirically - the cultural, social, and institutional co-evolution that led to this bifurcation. We highlight that groups...