U.S. stocks opened slightly lower on Thursday as investors focus on earnings, economic data and volatile oil prices. Weekly jobless claim and productivity growth came in below expectations. Lower guidance from big retailers such as Ralph Lauren Corp. and Kohl's Corp. weighed on sentiment. The S&P 500 opened 5 points, or 0.2%, lower at 1,909. The Dow Jones Industrial Average was down 18 points, or 0.1%, at 16,315 at the open. Meanwhile, the Nasdaq Composite began the day down 14 points, or 0.3%, at 4,490.
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