WASHINGTON — U.S. non-farm productivity edged up at a 0.9% annualized rate in the fourth quarter of 2011, after rising a revised 1.8% in the third quarter, the Labor Department reported Wednesday.

A month ago, Labor estimated non-farm productivity rose 0.7% in the fourth quarter. The gain reflected increases of 3.7% in output and 2.7% in hours worked, the department said.

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