All of these predictions shift, however, if economic troubles in America spread to other parts of the world, says Gartner Research analyst David Cearley.

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But the world was left with unstable floating exchange rates and all of their troubles.

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The U.S. economy remains sluggish, the Federal Reserve is keeping rates low by buying trillions of dollars of debt, and for all its troubles the U.S. remains the safest investment in the world.

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