Implied market volatility on Wall Street jumped to its highest level since late June on Monday, indicating investors are as nervous about future stock moves as they were right after the U.K.'s Brexit vote. The CBOE Volatility Index jumped 16% to 20.31, trading above the closely watched 20 handle for the first time since June 27. The index on Friday soared 40%, according to FactSet, after hawkish comments from Boston Federal Reserve President Eric Rosengren sparked fears interest rates could go up as soon as next week. Rosengren suggested the central bank should resume its rate tightening soon, rather than wait and risk missing its timing.U.S. stock futures were firmly lower on Monday morning, continuing a sharp selloff seen on Friday.
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