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Dow closes down 600 points after rollercoaster day

The Dow Jones Industrial Average on Monday closed at 15,871.28, down nearly 600 points (or 4 percent), due to growing concerns about China's economy. The final number was actually a marked improvement from the beginning of the day, when the Dow plunged by more than 1,000 points, the largest point loss ever during a single trading day, trumping even the Flash Crash of 2010.

The S&P 500, a larger index, was also down nearly 4 percent at the close of trading.