The theory of an OCA sets out benefits to be derived from increased trade. A comparison of the U.S. currency area with that of the Eurozone reveals that:

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The theory of an OCA suggests that increased trade benefits a currency union. Comparing the U.S. currency area with that of the Eurozone, interstate and inter-region trade in the United States is much larger as a percent of gross state product than the same figure for Europe. This suggests that the U.S. currency area may be a more viable OCA than the Eurozone. Option A is incorrect because the trade figures are not equal in both areas. Option B is incorrect because the opposite is true - interstate and inter-region trade is larger as a percent of gross state product in the United States compared to Europe. Option D is incorrect because trade comparisons are relevant to the success of a currency union, as they affect the degree of economic integration and the likelihood of optimal monetary policy for all member states.

The Theory of an OCA Sets Out Benefits to Be