Ben Bernanke is seen leaving his Washington, D.C., office on Jan. 31, his last day as chairman of the Federal Reserve. Saul Loeb/AFP/Getty Images hide caption

itoggle caption Saul Loeb/AFP/Getty Images

Janet Yellen during her confirmation hearing earlier this month. She's expected to win Senate approval to take over as head of the Federal Reserve. Brendan Smialowski /AFP/Getty Images hide caption

itoggle caption Brendan Smialowski /AFP/Getty Images

Janet Yellen, President Obama's nominee to become the next chairman of the Federal Reserve Board, is sworn in Thursday on Capitol Hill for her confirmation hearing. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP