From the moment he was elected president in 2016 through his failed campaign for re-election, Donald J. Trump invoked the stock market as a report card on the presidency.The market loved him, Mr. Trump said, and it hated Democrats, particularly his opponent, Joseph R. Biden Jr. During the presidential debate in October, Mr. Trump warned of Mr. Biden: “If he’s elected, the market will crash.” In a variety of settings, he said that Democrats would be a disaster and that a victory for them would set off “a depression,” which would make the stock market “disintegrate.”So far, it …
