The U.S. economy grew 2.8 percent in the third quarter, slightly below economists' expectations and down from the last quarter's pace, the Department of Commerce said Wednesday. Gross domestic product, a key indicator of the total value of goods and services produced, rose at an annual rate of 2.8 percent in the third quarter, down from 3 percent last quarter. Economists surveyed by the Wall Street Journal had forecasted a 3.1 percent growth rate this quarter. The report comes as the economy