U.S. Stocks Open With Sharp Gains; Dow Jumps 187 Points

By Anora MahmudovaMarketWatch Pulse

U.S. stocks opened sharply higher Friday, boosted by Federal Reserve Chairwoman Janet Yellen's signal late Thursday that the economy is strengthening and an interest-rate hike is likely before the end of the year. A revision to the second-quarter gross domestic product also showed the economy grew faster than first estimated. The main indexes were on track to finish the week roughly where they started. The S&P 500 opened 16 points, or 0.8%, higher at 1,948. The Dow Jones Industrial Average jumped 190 points, or 1.2%, to 16,387. The Nasdaq Composite began the day up 44 points, or 1%, at 4,779.

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