Investopedia explains 'Optimal Currency Area'
The primary test for the theory of optimal currency areas is the introduction of the euro as a common currency in many European nations. Eurozone countries matched well with Mundell's criteria for successful monetary union, providing the impetus for the introduction of a common currency. While the eurozone has seen many benefits from the introduction of the euro, it has also experienced problems such as the Greek debt crisis. Thus, the long-term outcome of monetary union under the theory of optimal currency areas remains a subject of debate.
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