U.S. stocks opened sharply higher Tuesday, tracking gains in global equity markets as investors bet that China's central bank will launch fresh stimulus in response to weak trade data. The U.S. stock market was closed on Monday for the Labor Day holiday. The S&P 500 opened 29 points, or 1.5% higher at 1,950. The Dow Jones Industrial Average gained 270 points, or 1.7%, to 16,361. The Nasdaq Composite began the day up 90 points, or 1.9% at 4,774.
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