If you take all the wealth of all the billionaires, it still is not enough to pay for her modest proposal.
Why let Reality get in the way of a good socialist proposal? When you tell them that taxpayers will modify their behavior to optimize revenue, it does not matter to them. It is a ‘feel good’ (envious), big ‘get even’!
No matter the tax rates, the tax revenue ratio to GDP will be under 20%.