Ah, the financial markets. A bastion of rational thought, meticulous forecasting, and serene predictability. Or, at least, that’s what the textbooks tell us. In the era of Donald J. Trump, however, Wall Street often resembles a teenager’s mood swings, reacting with dramatic flair to every pronouncement, tweet, or off-the-cuff remark from the former, and potentially future, President. The past week has been no exception, offering a fresh batch of policy pronouncements that sent some sectors into a tailspin w ...