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NEW YORK, NY - AUGUST 21: A screen on the floor of the New York Stock Exchange (NYSE) shows the market numbers near the close of the day on August 21, 2015 in New York City. The Dow fell over 500 points in trading today as global markets continue to react to economic events in China.  (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - AUGUST 21: A screen on the floor of the New York Stock Exchange (NYSE) shows the market numbers near the close of the day on August 21, 2015 in New York City. The Dow fell over 500 points in trading today as global markets continue to react to economic events in China.  (Photo by Spencer Platt/Getty Images)

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    Brutal selloff decimates markets by almost 600 points

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Brutal selloff decimates markets by almost 600 points

After initially dropping by 1,000 points, the Dow Jones Industrial Average has closed the day down almost 600 points. CNN's Richard Quest looks back at the tumultuous day.

Brutal selloff decimates markets by almost 600 points

After initially dropping by 1,000 points, the Dow Jones Industrial Average has closed the day down almost 600 points. CNN's Richard Quest looks back at the tumultuous day.