What are economists good for?

A trader rubs his face as he works on the floor of the New York Stock Exchange September 29, 2008 in New York City. U.S. stocks took a nosedive in reaction to the global credit crisis and as the U.S. House of Representatives rejected the $700 billion rescue package, 228-205. Dow Jones Industrials fell as much as 700 points in midday trading.
Photo by Spencer Platt/Getty Image
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