The VIX, an options-based measure of future swings in the S&P 500, surged 32 per cent in recent trading, on pace to 14. 54, its biggest one-day rise of the year. "The S&P dropped like a rock as soon as [the passenger jet news] came out," said Scott Wren, senior equity strategist at Wells Fargo Advisors. "These things can come out of nowhere.
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