Many social networks have the following properties: (i) a short average distancebetween any two individuals; (ii) a high clustering coe±cient; (iii) segregation pat-terns; the presence of (iv) brokers and (v) hubs. (i) and (ii) de¯ne a small worldnetwork. This paper develops a strategic...

We investigate how reputational uncertainty and the rate of change of the social environment interact to influence cooperation in social networks. Reputational uncertainty significantly decreases cooperation and welfare, induces more forgiveness toward defectors, and promotes opportunistic play....

Many social networks have the following properties: (i) a short average distance between any two individuals; (ii) a high clustering coefficient; (iii) segregation patterns; the presence of (iv) brokers and (v) hubs. (i) and (ii) define a small world network. This paper develops a strategic...

This paper presents a bargaining model between individuals belonging to different groups where the equilibrium outcome depends on the communication network within each group.  Belonging to a group gives an informational advantage: connections help to gather information about past transactions...