Abstract
In this paper I analyze the historical treatment of the problem of money price determinacy starting with Walras (1874) and Patinkin (1948) up to the latest results by Weil (1991) and Benassy (2007). I show then based on an extremely simple model that Walras’ Law does hold in a pure barter economy but not in a monetary economy, if money supply is modeled in a realistic way. As a consequence, in a monetary economy with N goods there are N independent market equilibrium conditions available to determine the N money prices of all goods. For many classes of models this equality of equations and unknown variables is sufficient to determine the money prices of goods unambiguously – even in the case of Ricardian economies, where money holdings are no net wealth.
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