U.S. stocks opened slightly lower on Tuesday as investors grappled with falling crude oil prices, weak economic data and mixed earnings results. The S&P 500 opened 7 points, or 0.3%, lower at 2,064.13, with the energy stocks selling off hard. The Dow Jones Industrial Average fell 71 points, or 0.4%, to 17,553.83. The Nasdaq Composite began the day down 7 points, or 0.2%, at 5,025.57.
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