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Existence of Uniqueness of "Money" in General Equilibrium: Natural Monopoly in the Most Liquid Asset

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  • Starr, Ross M.

Abstract

The monetary character of trade, use of a common medium of exchange, is shown to be an outcome of economic general equilibrium in the presence of transaction costs and market segmentation (in trading posts with a separate budget constraint at each transaction). Commodity money arises endogenously as the most liquid (lowest trasaction cost) asset. Scale economies in transaction cost account for uniqueness of the (fiat or commodity) money in equilibrium, creating a natural monopoly. Trading posts using a medium of exchange create a network externality inducing others' adoption of the same medium. Bertrand monetary equilibria (among competing trading posts) and uniqueness of 'money' are robust to threats of entry. Government-issued fiat money has a positive equilibrium value from its acceptability for tax payments and sustains its natural monopoly through the scale of government economic activity.

Suggested Citation

  • Starr, Ross M., 2002. "Existence of Uniqueness of "Money" in General Equilibrium: Natural Monopoly in the Most Liquid Asset," University of California at San Diego, Economics Working Paper Series qt660465rm, Department of Economics, UC San Diego.
  • Handle: RePEc:cdl:ucsdec:qt660465rm
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    References listed on IDEAS

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