A PART OF Donald Trump’s political genius is being all things to all people—or at least to all of his supporters. He has said so many contradictory things, throughout his public life and during the presidential campaign, that it is easy to latch onto the bits you like and either ignore those you don’t, or dismiss them as braggadocio. Investors, it seems, are no different. The former president’s decisive victory on November 5th sparked…