Ah, the stock market. A bastion of logic, predictability, and calm, right? Wrong. Especially when President Donald J. Trump is in the news cycle. In the ever-unpredictable theater of global finance, one constant remains: when Trump speaks, the market (and everyone else) listens, often with a mix of trepidation and a strange, morbid curiosity. The past few weeks have been a masterclass in this phenomenon, showcasing a dizzying array of policy pronouncements that have sent sectors soaring, others plummeting, ...