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.
You rightly point out that income disparity metrics can be manipulated, but changing the calculation (eg by ignoring Bezos) does nothing to change the actual disparity, it just makes it harder to detect... So what exactly is your point?
That the stat is not only subject to manipulation, it’s pointless.
If every American shopped on Rakuten vs Amazon, bought Samsung vs Apple, searched on Yandex instead of Google, banked at Barclays vs Chase, took a Didi vs Uber, if every hedge fund manager was based in Zurich vs Greenwich, US income disparity would not be so jarring, as the wealth would accrue elsewhere, exporting the income disparity with it.
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.