NEW YORK, March 16 - U.S. stocks turned negative on Monday after American Express Co said the number of people having trouble making credit card payments rose in February.
* Shares of American Express fell 1.6 percent to $12.88.
* The Dow Jones industrial average slipped 10.91 points, or 0.15 percent, to 7,213.07. The Standard & Poor's 500 Index fell 2.40 points, or 0.32 percent, to 754.15. The Nasdaq Composite Index dropped 27.54 points, or 1.92 percent, to 1,403.96.
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