I suspect the US could raise capital gains tax fairly substantially before it made sense for Bezos to move himself, his assets, and his company out of the US.

Maybe you're right. Maybe not. I don't know. I have somewhat the opposite opinion though — I believe people in his position have all manner of resources to facilitate the movement of assets.

> I believe people in his position have all manner of resources to facilitate the movement of assets.

Sure... and yet, Bezos hasn't moved his assets somewhere with zero capital gains tax, like Switzerland. There are clearly benefits to being in the US that are worth the 20% tax rate to him. I think a lot of them would still be present if it were 30-40%.