In fact, fifty-seven percent of investors are now optimistic about economic growth – up from 45 percent in the third quarter – while only 27 percent are pessimistic, down from 35%, according to new Wells Fargo research. “The primary reason that investors have become more positive and the market has rallied since the election is that the two biggest unknowns for 2016 were eliminated in the last quarter of the year,” said J.J. Kinahan, chief market strategist at TD Ameritrade.