U.S. stocks opened slightly higher on Friday, but steady gains over the week meant the indexes are on track for a fifth straight weekly gain. The main indexes are also eyeing the strongest monthly gains in four years. The S&P 500 opened 2 points, or 0.1%, higher at 2,092. The Dow Jones Industrial Average advanced 23 points, or 0.1%, to 17,776. The Nasdaq Composite began the day up 8 points, or 0.2%, at 5,082.
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