This Is the Worst Momentum Swing for U.S. Stocks in History

Nandini Ramakrishnan of JPMorgan Asset Management says this volatility was expected.(Source: Bloomberg)

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By Luke Kawa and Dani Burger

February 9, 2018 at 5:56 PM UTC

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Oh, how quickly the good times soured.

The S&P 500 Index’s 14-day relative strength index -- a technical gauge of the magnitude and speed of price movements -- has swung 57 points lower over the past two weeks.