U.S. stocks closed sharply lower on Friday, ending the week with the biggest percentage declines since Sept. 23, 2011. That also marks the worst opening week of the year in history for both the S&P 500 and the Dow. The S&P 500 closed 21.08 points, or 1.1%, lower at 1,922.02 and booked a 6% weekly loss. The Dow Jones Industrial Average dropped 167.65 points, or 1%, to 16,346.45 and reported a 6.2% weekly decline. Meanwhile, the Nasdaq Composite ended the day down 45.80 points, or 1%, at 4,643.63 and was down 7.3% over the week.
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