Worker productivity slowed sharply in the final three months of last year as the economy lost momentum.The Labor Department reported Wednesday that productivity - the amount an employee produces for every hour on the job - increased at an annual rate of just 1.9 percent in the October-to-December quarter. This key measure of workplace efficiency was down considerably from the third quarter's brisk, 6.3 percent growth rate and was the slowest pace since the first quarter of last year.
