WASHINGTON — U.S. non-farm productivity rose 1.6% in the first quarter of 2011, according to the Labor Department’s first estimate released Thursday after a revised 2.9% gain for the fourth quarter of 2010.

Unit labor costs, the ratio of hourly compensation to productivity, rose 1.0% after a revised decline of 1.0% in the fourth quarter. Output and hours worked were both revised lower.

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