The productivity of U.S. workers rose in the fourth quarter, according to the U.S. Department of Labor, Bloomberg reported. The measure of employee output per hour increased at a 3.2 percent annualized rate, after a revised 3.6 percent gain in the prior three months, which was more than initially reported, according to the report. The median forecast in a Bloomberg survey of economists called for a 2.8 percent advance in the fourth quarter. Expenses per worker decreased at a 1.6 percent pace, more than estimated.