FILE- In this Thursday, Jan. 12, 2012, file photo, Thomas Warren installs a fuel cell on a Freightliner truck at a plant in Cleveland, N.C. U.S. worker productivity fell by the largest amount in a year from January through March, the Labor Department reported Wednesday, June 6, 2012. Productivity fell at an annual rate of 0.9 percent in the first quarter. (AP Photo/Chuck Burton, File)

Associated Press
FILE- In this Thursday, Jan. 12, 2012, file photo, Thomas Warren installs a fuel cell on a Freightliner truck at a plant in Cleveland, N.C. U.S. worker productivity fell by the largest amount in a year from January through March, the Labor Department reported Wednesday, June 6, 2012. Productivity fell at an annual rate of 0.9 percent in the first quarter. (AP Photo/Chuck Burton, File)
FILE- In this Thursday, Jan. 12, 2012, file photo, Thomas Warren installs a fuel cell on a Freightliner truck at a plant in Cleveland, N.C. U.S. worker productivity fell by the largest amount in a year from January through March, the Labor Department reported Wednesday, June 6, 2012. Productivity fell at an annual rate of 0.9 percent in the first quarter. (AP Photo/Chuck Burton, File)
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