Abstract
In this paper, we study a two-country world economy and consider various designs of monetary union. We argue that the success of monetary union depends on: (i) the commitment ability of the single central bank, (ii) the policy flexibility of the national fiscal authorities and the central monetary authority and (iii) the cross country correlation of shocks. If, for example, the central bank moves before the fiscal authorities, then a monetary union will increase welfare as long as fiscal policy is sufficiently responsive to shocks. However, if the fiscal authorities have restricted set of tools and/or the monetary authority lacks the ability to commit to its policy, then monetary union may not be desirable.
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