Abstract:
Two approaches to the theory of OCA are distinguished in this paper. The first attempts to define the OCA from the point of view of a single country, and the second examines the optimality of a currency area of a given size anf membership. The present paper after reviewing the drawbacks of the marginalistic approach which looks at the determination of a currency area from the point of view of a single country, deals with the second approach, and argues that a currency area is optimal when the welfare functions of its constituent members are in the core.