U.S. stocks began the week and the month on a sour note Monday with the Dow industrials giving up 123 points at the market open. The main indexes declined as oil prices marched lower and as China's economy hit another bump. The S&P 500 opened 13 points, or 0.7%, lower at 1,927. The Dow Jones Industrial Average fell 123 points, or 0.7%, to 16,343. 54Meanwhile, the Nasdaq Composite began the day down 28 points, or 0.6%, at 4,586.
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