Higher income tax rates are a blunt instrument applied to a problem (wealth inequality) caused by structural changes in the world economy. They will be superficially helpful but second and third order effects ought to be fully modeled and debated. The wealthy are extremely mobile and the United States is no longer as competitive a place to live as it was post WWII. We can likely model this effect on lost tax revenue but what of what is the cost of losing an Elon Musk?