> High marginal tax rates on super-high levels of income and/or wealth doesn't discourage working.
Do we have precedence for this? From what I'm aware, even when the US had high marginal tax rates which some dems seem to be calling to bring back, no one ever paid those rates because there are always ways for the very rich to reduce their income on paper, while still increasing their wealth.
I do agree with you that it takes a very special kind of person to have the wealth of Elon or Bezos and still continue to want to work, it's obviously more than money at that point. But those people are outliers. I know I wouldn't be motivated to spend more effort if it meant a proportional decrease in the total amount of money I would end up pocketing due to increased taxes.
High marginal tax rates on super-high levels of income and/or wealth doesn't discourage working. It just makes doing something to add another chunk to your income/wealth require something other than financial renumeration. There's plenty of evidence that humans do their best work when they have intrinsic and not extrinsic motivation.
Bezos is a case in point. I believe him to have an almost absurdly high level of intrinsic motivation (I worked with him for 15 months). He might like the wealth he has, but the things he will continue to do with his life, just like Amazon itself, get done for reasons beyond money.