Would would happen to the US economy if the dollar stopped being the world's reserve currency overnight?

Shelves of Wal-marts going empty overnight? DJA dropping 50%? Mass panic? http://en.wikipedia.org/wiki/Bretton_Woods_system "The liberal economic system required an accepted vehicle for investment, trade, and payments. Unlike national economies, however, the international economy lacks a central... show more Shelves of Wal-marts going empty overnight? DJA dropping 50%? Mass panic?

http://en.wikipedia.org/wiki/Bretton_Woods_system

"The liberal economic system required an accepted vehicle for investment, trade, and payments. Unlike national economies, however, the international economy lacks a central government that can issue currency and manage its use. In the past this problem had been solved through the gold standard, but the architects of Bretton Woods did not consider this option feasible for the postwar political economy. Instead, they set up a system of fixed exchange rates managed by a series of newly created international institutions using the U.S. dollar (which was a gold standard currency for central banks) as a reserve currency."
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