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Janet Yellen, chair of the U.S. Federal Reserve, speaks during a news conference following a Federal Open Market Committee (FOMC) meeting in Washington, D.C., U.S., on Wednesday, Sept. 21, 2016. 'The sad fact is we are getting the healthy pace of job growth, without a healthy pace of output growth,' which has led to downward shifts in U.S. central bank's projected rate path, Yellen said. Photographer: Pete Marovich/Bloomberg via Getty Images

Janet Yellen, chair of the U.S. Federal Reserve, speaks during a news conference following a Federal Open Market Committee (FOMC) meeting in Washington, D.C., U.S., on Wednesday, Sept. 21, 2016. 'The sad fact is we are getting the healthy pace of job growth, without a healthy pace of output growth,' which has led to downward shifts in U.S. central bank's projected rate path, Yellen said. Photographer: Pete Marovich/Bloomberg via Getty Images