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An implicit rationale for a bank reserve requirement is that a central monetary authority is in a unique position (as "social planner) to impose a "socially superior" outcome to that yielded by a free banking system. We illustrate how this can be true in the context of a simple economy modeled to mimic certain basic characteristics of a monetary economy with banks and agents who trade with one another. Banks exist in our model because by pooling liquidation risks they provide liquidity otherwise unavailable to depositors, which, in turn, provides the incentivefor using deposit claims as the medium of exchange.

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