Federal Reserve Chairman Ben Bernanke arrives for a dinner at the Jackson Hole Economic Symposium, Thursday, Aug. 30, 2012, at Grand Teton National Park near Jackson Hole, Wyo. (AP Photo/Ted S. Warren)

Federal Reserve Chairman Ben Bernanke, left, walks with a member of his security detail, center, and Michelle Smith, right, of the Board of Governors of the Federal Reserve System, as they arrive for a dinner at the Jackson Hole Economic Symposium with his wife Anna, Thursday, Aug. 30, 2012, at Grand Teton National Park near Jackson Hole, Wyo. The world's financial markets will shift their attentions from the centers of global commerce on Friday to Jackson Hole, Wyo., where Bernanke will deliver a speech at the Jackson Hole Economic Symposium. (AP Photo/Ted S. Warren)

Federal Reserve Chairman Ben Bernanke, center, walks with Susan Collins, right, Dean of the Gerald R. Ford School of Public Policy at the University of Michigan, during a break in the Jackson Hole Economic Symposium, Friday, Aug. 31, 2012, at Grand Teton National Park near Jackson Hole, Wyo. (AP Photo/Ted S. Warren)

Federal Reserve Chairman Ben Bernanke, right, and Bank of Israel Governor Stanley Fischer walk together outside of the Jackson Hole Economic Symposium, Friday, Aug. 31, 2012, at Grand Teton National Park near Jackson Hole, Wyo. (AP Photo/Ted S. Warren)

With the Teton Mountains behind them, Federal Reserve Chairman Ben Bernanke, left, and Bank of Israel Governor Stanley Fischer walk together outside of the Jackson Hole Economic Symposium, Friday, Aug. 31, 2012, at Grand Teton National Park near Jackson Hole, Wyo. Bernanke made clear Friday that the Federal Reserve will do more to boost the economy because of high U.S. unemployment and an economic recovery that remains "far from satisfactory." (AP Photo/Ted S. Warren)