In an effort to stabilize their economies, a number of South American countries have fixed the value of their currencies to the American dollar. In Argentina, for example, bank customers can get their money in either pesos or U.S. dollars. They're worth the same amount. But there's a downside to the move -- those countries have essentially ceded control over their economies. Some of them are now reconsidering the idea. NPR's Martin Kaste reports.
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