Ah, the financial markets. A bastion of calm, predictable rationality, right? Not when former President Donald J. Trump is in the news cycle. This past week has offered investors a masterclass in policy-induced whiplash, as the markets attempted to digest a dizzying array of pronouncements ranging from trade breakthroughs with China to the rather casual resurrection of nuclear weapons testing. It’s enough to make even the most seasoned analyst reach for a stronger brew, or perhaps a direct line to Truth Soc ...