This paper presents a class of examples where a barter economy develops through agents' optimizing decisions into a monetary economy. A barter economy with m commodities is characterized by m(m-1)/2 commodity pair trading posts for active trade of each good for every other. Monetary equilibrium...

This essay derives the monetary character of trade, the existence of a common medium of exchange, as an outcome of the economic general equilibrium in a class of examples. The setting is a (non-monetary) Arrow-Debreu Walrasian model with the addition of two constructs: multiple budget...