U.S. stocks surged Tuesday. The Dow Jones industrial average rose 558.99, or 2.4 percent, to 23,949.76. The broader Standard & Poor's 500 index rose 84.43, or 3.1 percent, to 2,846.06. The technology-heavy Nasdaq composite index rose 323.31, or 3.95 percent, to 8,515.74.