Tobin, James - Cowles Foundation for Research in Economics, Yale University - 1992
Among the conventions of almost every human society of historical record has been the use of money, i.e., particular … commodities or tokens as measures of value and media of exchange in economic transactions. Somehow the members of a society agree … convention, not the particular media agreed upon, is the source of money's immense value to the society. In this respect money is …