Vice Chair of the U.S. Federal Reserve Janet Yellen testifies during her nomination hearing to chair the Federal Reserve before the Senate Banking Committee on Capitol Hill in Washington D.C., capital of the United States, Nov. 14, 2013. The Federal Reserve has more work to do to bolster the economy which is performing far short of potential, Janet Yellen, President Barack Obama's nominee to lead the U.S. central bank, said Thursday.
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