Has the stock market learned its lesson yet on underestimating Donald Trump?

Open this photo in gallery: A picture of U.S. President Donald Trump is taped up on the floor of the New York Stock Exchange, on March 7.Spencer Platt/Getty Images Kevin Yin is a contributing columnist for The Globe and Mail and an economics doctoral student at the University of California, Berkeley. U.S. equities have lost more than US$4-trillion in value after the administration of Donald Trump declined to rule out recession as a result of its tariff policies. What the U.S. President promised was going to be a golden age of economic growth has not, to date, transpired, and equity…