Wall Street opens higher as Britain votes on EU membership

Markets across the globe have been rattled over the past two weeks as investors speculated about the consequences of Britain's exit from the European union, including the unraveling of the bloc. U.S. markets also took solace in Fed Chair Janet Yellen's two-day testimony this week when she expressed optimism about the economy and downplayed the chances of a recession this year. "The markets are the best judge of what is going to happen and they are saying that Britain will remain.