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Traders and financial professionals work on the floor of the New York Stock Exchange (NYSE) ahead of the closing bell on August 10, 2018 in the Brooklyn borough of New York City. The Dow Jones Industrial Average closed down nearly 200 points on Friday, as markets reacted negatively to a sharp plunge in Turkish currency, the Lira, as Turkey heads toward a potential financial crisis. U.S. President Donald Trump has also authorized a doubling of metal tariffs on Turkey.