U.S. stocks have rallied the most in January since 1997, pushing down the benchmark gauge for U.S. options prices by the most ever as dealers find fewer buyers for protection against equity losses. The VIX (VIX) has plunged 60 percent to 18.28 since the S&P 500 reached its 2011 low on Oct. 3, the biggest decrease ever, according to data compiled by Bloomberg.
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