FILE - In this Jan. 26, 2011 file photo, an assembly line worker welds a cab frame on a Volvo truck at the plant in Dublin, Va. U.S. workers increased their productivity this summer by the largest amount in a year and half, and they cost their employers less. The trend is good for corporate profits but not necessarily for job growth.(AP Photo/Steve Helber, File)

Associated Press
FILE - In this Jan. 26, 2011 file photo, an assembly line worker welds a cab frame on a Volvo truck at the plant in Dublin, Va. U.S. workers increased their productivity this summer by the largest amount in a year and half, and they cost their employers less. The trend is good for corporate profits but not necessarily for job growth.(AP Photo/Steve Helber, File)
FILE - In this Jan. 26, 2011 file photo, an assembly line worker welds a cab frame on a Volvo truck at the plant in Dublin, Va. U.S. workers increased their productivity this summer by the largest amount in a year and half, and they cost their employers less. The trend is good for corporate profits but not necessarily for job growth.(AP Photo/Steve Helber, File)
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