A measure of sterling’s expected fluctuations over the next month versus the dollar jumped to the highest level since February 2009 as investors prepare for the U.K.’s June 23 referendum on whether to leave the European Union. One-month pound-dollar implied volatility soared to 21.25 percent on June 1 from about 10 percent a month earlier, data compiled by Bloomberg show. The equivalent gauge for the euro remained little changed in a range of about 9 percent to 10 percent during the period.
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