Ah, the stock market. A bastion of rational thought, predictable trends, and calm, measured reactions. Or, at least, that’s what the textbooks tell us. In the era of Donald J. Trump, however, the market often resembles a particularly caffeinated squirrel navigating a minefield of Truth Social posts and impromptu policy pronouncements. Investors, it seems, have learned to strap in, brace for impact, and perhaps keep a bottle of antacids handy. The latest round of tariff threats, trade talks, and pharmaceutic ...