Janet Yellen, vice chairman of U.S. Federal Reserve, left, talks with Donald L. Kohn, a senior fellow at the Brookings Institute and former vice chairman at the Fed, as they leave the morning session at the economic symposium sponsored by the Kansas City Federal Reserve Bank at the Jackson Lake Lodge in Moran, Wyoming, U.S., on Friday, Aug. 31, 2012. U.S. Federal Reserve Chairman Ben S. Bernanke, decrying the suffering caused by unemployment of more than 8 percent and defending his unprecedented policies, said in a speech today at the symposium that more bond purchases are an option as central bankers weigh further steps to spur growth. Photographer: Price Chambers/Bloomberg via Getty Images
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