Social Capital, the advantage created by location in social structure, is a critical element in business strategy. Who has it, how it works, and how to develop it have become key questions as markets, organizations, and careers become more and more dependent on informal, discretionary...

Ronald Burt describes the social structural theory of competition that has developed through the last two decades. The contrast between perfect competition and monopoly is replaced with a network model of competition. The basic element in this account is the structural hole: a gap between two...