The US dollar has been the preferred reserve currency and method of international exchange since the end of WWII. How much longer can this continue? After all, the rest of the world wants a say about how the global financial system works. But is there an alternative to the greenback? Also, should Sam and Courtney get euros and pounds now or later? In this week's Trading Perspectives, Sam, Courtney and John discuss the global currency markets, the best way to exchange currencies for the average traveler and whether the U.S. dollar will ever falter.

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