Federal Reserve Board Chairman Ben Bernanke poses in the board room of Federal Reserve headquarters in Washington in this Jan. 26, 2007, file photo. The Fed has taken its boldest action since the Great Depression, invoking rarely used legal powers in efforts to contain financial panic undermining the U.S. economy. And it acted with a speed that the White House and Congress could only envy. Fed officials have long claimed they had only a limited arsenal of instruments to prop up the economy. But Bernanke, in the first critical test of his leadership since he took over from Alan Greenspan in February 2006, may have proved otherwise. (AP Photo/Manuel Balce Ceneta, File)

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