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b"The concept of a single worldwide currency has been suggested since the 16th century, and came close to being instituted after World War II -- yet the idea remains little more than that. Proponents argue that a universal currency would mean an end to currency crises like Zimbabwe's. A single currency wouldn't be subject to exchange rate fluctuations because there would be no competing currencies to exchange against. In other words, a universal currency would lose its value as a commodity bought and sold on open markets and would have value only for its worth in buying other commodities."