FC is measured by family income. HC is generally measured by parents' education. It gives children access to the adult's HC and depends on both the parents' physical presence and the attention they give the child. SC outside the family - SC can also be found in the relationships outside the home, in the relationships between parents and in the parents' relations with the institutions of the community. Physical capital and human capital both allow the person who possesses the capital to benefit from it.
Social capital is a public good.
It requires investments of time on the part of people who will not reap the complete benefits of their investment. The withdrawal of major investors in SC who exit to pursue other interests can have serious costs for the entire group. An action may have small costs for the individual do it, but much greater costs for the group as a whole. Coleman says we should try to find ways to increase SC, probably through the creation of some formal institution.