The best thing you can say about Donald Trump's latest economic plan is that some of it (not all) isn't as nutty as his last one. But like all Republican plans for the economy, it's predicated on the assumption that if you slash taxes for wealthy people, there will be all sorts of wonderful economic growth that will make up for the huge deficits it will create. This has been tried over and over and it's never worked as predicted but, hey, why let that stop anyone? Jonathan Chait has more.