Few social scientists have equaled the impact on political science of Douglass C. North, co-winner of the Nobel Memorial Prize in Economics in 1993. His extraordinary influence emanated from his ideas but was also a result of his vast social network of collaborators, students, and friendly...

The new institutionalism arose in the 1980s, in reaction to narrowly individualistic approaches in economics, political science, and sociology. The new institutionalists claim that rules, norms, and customs — often arbitrary and artificial — structure human interaction and can explain major...