Producers of metals and other raw materials ticked down as traders rotated out of rate-sensitive sectors in light of troubling data in a consumer-sentiment survey.

Technology stocks in the S&P 500 were dropping sharply Friday, making them the worst-performing sector of the U.S. equities benchmark in afternoon trading, according to FactSet data, at last check.

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The P/E ratio measures a company's stock price relative to its earnings per share. A high P/E suggests that a stock has become expensive compared to its earnings - a crucial fundamental for a company ...