Janet Yellen, of California, President Barack Obama's nominee to become Federal Reserve Board chair, testifies on Capitol Hill in Washington, Thursday Nov. 14, 2013, before the Senate Banking Committee hearing on her nomination to succeed Ben Bernanke. (AP Photo/Jacquelyn Martin)

Photo by: Jacquelyn Martin

Janet Yellen, of California, President Barack Obama's nominee to become Federal Reserve Board chair, testifies on Capitol Hill in Washington, Thursday Nov. 14, 2013, before the Senate Banking Committee hearing on her nomination to succeed Ben Bernanke. (AP Photo/Jacquelyn Martin)