Capital is typically thought of in financial terms. Consider the following definition for example: "Wealth in the form of money or assets, taken as a sign of the financial strength of an individual, organization, or nation, and assumed to be available for development or investment." Source: Business Dictionary.com
As suggested in the definition, wealth can also take the form of nonfinancial assets such as expertise, influence, land, built structures, equipment and time. The capital assets that could be considered for building local economies in localfoodsystems.org include all forms of capital including social, natural, built, human, and financial.
Read more: http://www.businessdictionary.com/definition/capital.html#ixzz1q33AYmPn
Read more about time as capital at Time Banks USA: http://timebanks.org