The U.S. economy is showing significant signs of a rebound Tuesday. The Commerce Department revised its figures for third-quarter growth, showing gross domestic product grew at an annualized rate of 5.0 percent. Previous Commerce estimates had pegged growth at just 3.9 percent. The number marks the strongest pace of U.S. economic growth since the third quarter of 2003. The Dow Jones Industrial Average also traded above 18000 for the first time on Tuesday.