I'm strongly in favour of this. I think income tax should approach 100%. So your second billion you still make more. But not twice as much. The exact decay function is up to date. But I really don't think your post-tax take home should scale linearly with your income once you hit the max bracket.

We can also remove all of the loopholes that result in the biggest companies paying basically no taxes. I also think it may make sense to have a dramatically different tax structure for businesses than effectively income tax.