FILE - In this Wednesday, May 22, 2013, file photo, Federal Reserve Chairman Ben Bernanke listens as he testifies on Capitol Hill in Washington, before a Senate Joint Economic Committe

 

              FILE - In this  Wednesday, May 22, 2013, file photo, Federal Reserve Chairman Ben Bernanke listens as he testifies on Capitol Hill in Washington, before a Senate Joint Economic Committe
FILE - In this Wednesday, May 22, 2013, file photo, Federal Reserve Chairman Ben Bernanke listens as he testifies on Capitol Hill in Washington, before a Senate Joint Economic Committee hearing on "The Economic Outlook" . Investors have grown nervous that the Federal Reserve will scale back its efforts to boost the U.S. economy sooner than many expected. (AP Photo/Manuel Balce Ceneta)