On Friday, October 19, U.S. stocks tumbled, as quarterly reports from industry heavy hitters proved that the global economy is slowing. The Dow Jones Industrial Average dropped 1.2%, to 13,388.86; the Standard & Poor 500 Index inched lower 1.3%, to 1,438.14, while Nasdaq 100 futures fell 1.9%, to stand at 3,014.05.