U.S. stocks opened lower on Monday, as a drop in oil prices along with downbeat trade data from China weighed on sentiment. The S&P 500 was down one point, or less than 0.1%, to 2,056. The Dow Jones Industrial Average was down 20 points, or 0.1%, to 17,727 at the open. Meanwhile, the Nasdaq Composite began the session down a point, or less than 0.1%, at 4,735.
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