Federal Reserve policymakers left rates unchanged, saying they were worried about job growth and did not want higher rates to affect hiring. Karen Bleier/AFP/Getty Images hide caption

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An employee prepares to install the hood on a vehicle at a General Motors plant in Arlington, Texas. Federal Reserve policymakers say recent indicators point to a strengthening labor market. Bloomberg via Getty Images hide caption

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Federal Reserve Board Chair Janet Yellen listens to questions during a House Financial Services Committee hearing on Capitol Hill on Wednesday. Delivering the Federal Reserve's semiannual Monetary Policy Report to the House Committee, Yellen aired caution about global economic conditions. Mark Wilson/Getty Images hide caption

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Federal Reserve Chair Janet Yellen testifies before the Senate Banking Committee in July. This week, Yellen and other policymakers are weighing the Fed's first rate increase in nine years. Susan Walsh/AP hide caption

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Federal Reserve Board Chair Janet Yellen gestures as she testifies during a Senate Banking, Housing and Urban Affairs Committee hearing while delivering the Federal Reserves semiannual Monetary Policy Report on Capitol Hill Thursday. Mark Wilson/Getty Images hide caption

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The Senate has approved Janet Yellen as the next head of the Federal Reserve. At a ceremony commemorating the Fed's centennial last month, Yellen sat with (from left-to-right) former chairmen Paul Volker and Alan Greenspan, and current Fed leader Ben Bernanke. Mark Wilson/Getty Images hide caption

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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

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