In explicating the concept of social capital, three forms were identified: obligations and expectations, which depend on trustworthiness of the social environment, information-flow capability of the social structure, and norms accompanied by sanctions. A property shared by most forms of social capital that differentiates it from other forms of capital is its public good aspect: the actor or actors who generate social capital ordinarily capture only a small part of its benefits, a fact that leads to underin-

DEFINE: Defines social capital and its three forms while clarifying the distinctive public good aspect that sets it apart from other capital forms.

Coleman, SocialCapitalCreation-1988, loc. 236