The work of Robert Mundell was useful when the nations of the European Union established a single currency.

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Robert Mundell was a Canadian economist who developed the theory of Optimum Currency Areas (OCA). This theory helps in determining whether a group of countries would benefit from a single currency or if they should maintain their own currencies. The theory of OCA was instrumental in the establishment of the Eurozone, where several countries adopted a single currency, the Euro. Therefore, the work of Robert Mundell was indeed useful when the nations of the European Union established a single currency.

The Work of Robert Mundell Was Useful When the Nations