WASHINGTON (AP) — U.S. workers' productivity increased in the July-September quarter at a slightly faster pace than previously estimated while labor costs declined for a second straight quarter. The strengthening of productivity growth combined with a faster drop in labor costs should reassure the Federal Reserve that there is little threat of unwanted inflation pressures harming economic growth any time soon. The slightly faster productivity growth compared to an initial estimate one month ago reflected revisions the government made to the gross domestic product, the economy's total output of goods and services.