ZURICH, Switzerland ꟷ UBS CEO Sergio Ermotti said Wednesday that market volatility could intensify in the second half of the year, but he does not believe the U.S. is heading into a recession.Global equities saw sharp sell-offs last week as investors digested weak economic data out of the U.S. which raised fears about an economic downturn in the world's largest economy. It also raised questions about whether the Federal Reserve needed to be less hawkish with its monetary policy stance. The central bank kept ...