WASHINGTON, DC - FEBRUARY 11: Janet Yellen, the new Federal Reserve Board chairwoman, laughs at a joke as she appears before the House Financial Services Committee to give her first testimony as Fed chair on February 11, 2014 in Washington, DC. After two weak monthly jobs reports, Yellen's tesitmony is being watched closely for signs of the Fed's intentions to change course from tapering its bond-buying program. (Photo by T.J. Kirkpatrick/Getty Images)
