File photo of U.S. Federal Reserve Chairman Ben Bernanke preparing to speak at the December luncheon meeting of the Economic Club of Washington

 
File photo of U.S. Federal Reserve Chairman Ben Bernanke preparing to speak at the December luncheon meeting of the Economic Club of Washington
U.S. Federal Reserve Chairman Ben Bernanke prepares to speak at the December luncheon meeting of the Economic Club of Washington, in this December 7, 2009 file photo. U.S. Federal Reserve officials moved to calm speculation that a surprise rise in its emergency lending rate could bring forward broader policy tightening, saying borrowing costs in the economy would stay low. Bernanke flagged the move last week, saying the U.S. central bank aimed to widen the spread between its main policy rate that remains pegged near zero and the discount rate at which banks can borrow from the Fed. REUTERS/Jason Reed/Files (UNITED STATES - Tags: POLITICS BUSINESS HEADSHOT)