The income disparity is the game of numbers. When Jeff Bezos’ income increases due to the work of his US employees, people notice. When Saudi Arabian King’s net worth increases due to the work of his US employees (and employees of any affiliated companies controlled by Saudis), people don’t notice it as much, since the King does not file a personal tax return with IRS.

If you were to strip everybody in the Forbes 1000 list of their US citizenship (someone like Singapore or Monaco would surely step up to provide them with a valid passport), relieve them of IRS personal income filing duty, but allow their money to stay in the US economy, the economy would look the same and act the same. But the income disparity numbers would look much brighter.