Stocks ended mixed Friday after a flat and disappointing reading on overall July retail sales caused a mild hangover on Wall Street, a day after investors were partying like it's 1999 after the Dow, S&P 500 and Nasdaq all hit records on the same day for the first time since New Year's Eve in 1999.The retail sector was driving the action on Wall Street for the second straight day. Early Friday, overall retail sales came in flat for July, well below the gain of 0.5% economists had forecast. That soured sentiment a day after better-than-anticipated earnings from individual retailers.

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