U.S. economic growth braked more sharply than initially thought in the fourth quarter amid a moderate increase in business inventories and a wider trade deficit, but strong domestic demand brightened the outlook. Gross domestic product expanded at a 2.2 percent annual pace, revised down from the 2.6 percent pace estimated last month, the Commerce Department said on Friday. The economy grew at a 5 percent rate in the third quarter. Businesses accumulated $88.4 billion worth of inventory in the fourth quarter, far less than the $113.1 billion the government had estimated last month.