US stocks closed lower Wednesday after several economic indicators raised doubts about the strength of the recovery. At the closing bell, the Dow Jones Industrial Average fell 47.15 points (0.34 percent) to 13,880.39. The broad-based S&P 500 retreated 9.57 points (0.63 percent) to 1,502.38, while the tech-rich Nasdaq Composite dropped 32.92 (1.04 percent) to 3,131.49.