In most Keynesian-type macroeconomic models the financial sector is modelled in terms of money demand, money supply and money market equilibrium. The market equations for private and government debt, i.e. credit, are implicit in these models by virtue of Walras' Law and need not be explicitly specified. Market equations for existing physical capital, or shares in capital, are absent from these models on the tacit assumption that physical capital cannot be traded and, consequently, has no market price. Money in these models is a substitute for private and government debt, not for current...