A Walrasian Theory of Money and Barter

Abhijit Banerjee and Eric Maskin

The Quarterly Journal of Economics, 1996, vol. 111, issue 4, 955-1005

Abstract: We study a barter economy in which each good is produced in two qualities and no trader can distinguish between the qualities of those goods he neither consumes nor produces. We show that in competitive equilibrium there exists a (unique) good—the one for which the discrepancy between qualities is smallest—that serves as the medium of exchange: this good mediates every trade. Equilibrium is inefficient because production of the medium would be lower if it were not for its mediating role. Introducing fiat money enhances welfare by eliminating this distortion. However, high inflation drives traders back to the commodity medium.

Date: 1996
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