U.S. stocks opened slightly lower Thursday as investors were cautious ahead of minutes from the Federal Reserve's most recent policy-setting meeting. The Dow Jones Industrial Average looked set to snap a four-day winning streak, opening 50 points, or 0.3%, lower at 16,867. The S&P 500 opened 6 points, or 0.3%, lower at 1,989. The Nasdaq Composite began the day down 20 points, or 0.4%, at 4,770.
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