Has Wall Street hit peak stock-market elation? Exuberance has the Dow Jones Industrial Average on the brink of piercing through a milestone of 20,000—a level it has never hit before.Perhaps, that is why some market experts are espousing an unequivocally bullish outlook for equities. That level of enthusiasm was on full display after Robert Doll, Nuveen Asset Management’s chief equity strategist, on Wednesday said he was “fully invested” in the market. Asked by one CNBC reporter if he recommended keeping any cash holdings, sometimes viewed as an alternative asset in an ultralow-yield environment or tanking stocks (or ... (full story)