Ah, the stock market. A bastion of rational exuberance, or so we’re told. That is, until former President Donald J. Trump decides to weigh in. In what has become a familiar, albeit consistently bewildering, dance, the markets once again found themselves whipsawed by a flurry of pronouncements, threats, and “great deals” emanating from the Trump orbit this past week. Investors, bless their optimistic hearts, continue to parse every tweet and press conference, attempting to discern whether the latest policy p ...