These families have intergenerational closure that is based on a multiplex relation: whatever other relations they have, the adults are members of the same religious body and parents of children in the same school. In contrast, it is the independent private schools that are typically least surrounded by a community, for their student bodies are collections of students, most of whose families have no contact. The choice of private school for most of these parents is an individualistic one, and, although they back their children with extensive human capital, they send their children to these schools denuded of social capital.

Coleman, SocialCapitalCreation-1988, loc. 183