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Roller coaster ride

Traders and financial professionals work on the floor of the New York Stock Exchange (NYSE) at the closing bell, Feb. 2, 2018 in New York City. The Dow dropped 250 points at the open on Friday morning. The Dow plunged over 660 points on Friday, marking its biggest one-day plunge since June 2016 following the Brexit vote. Photo from Drew Angerer/Getty Images.