Donald Trump loves the 1980s. After all, that was when his celebrity rose in New York, when Trump Tower was built, when The Art of the Deal was published, and when he first learned he could get away with flagrant racism (Central Park Five, anyone?). So we shouldn't be surprised, as Paul Krugman points out in his Monday column, that Trump's latest fumbling attempt at an accomplishment in his first 100 days, a "massive" tax cut plan, includes another greatest hit of the Reagan era. Supply-side economics, aka trickle-down economics, is the lie that deep tax cuts for the rich will spur them to jump-start the economy for everyone/support the poor/make unicorns shoot out of the sky.