U.S. stocks opened marginally higher Friday and the main indexes were on track to post solid weekly gains. Friday's modest opening gains follow days of global equity-market rallies, in part fueled by a sharp rebound in commodity prices. The S&P 500 opened 2 points, or 0.1%, higher at 2,015 and was on track to post its biggest weekly gain this year. The Dow Jones Industrial Average added 29 points, or 0.2% to 17,082. The Nasdaq Composite began the day up 3 points, or less than 0.1%, at 4,813.
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