U.S. stocks opened lower on Monday as investors continued to fret about slowdown in China and the possibility that the Federal Reserve might increase interest rates in September. The main indexes were on track to record their biggest monthly declines since October 2008, at the height of the financial crisis. The S&P 500 opened 9 points, or 0.4% lower at 1,980. The Dow Jones Industrial Average lost 100 points, or 0.6%, to 16,541 at the open. The Nasdaq Composite began the day down 26 points, or 0.5% at 4,803. All three of the main indexes were on track for monthly losses of around 6%.
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