If she wants to get money from Warren Buffett, she needs to tax WEALTH, not INCOME. Maybe she needs an economist to explain the difference - a run-of-the-mill economist, not a clueless nobel prize winner.
Warren Buffett manages to pay less taxes than his secretary because he has no income. He doesn’t pay himself enough to make a dent in tax revenue. He doesn’t sell his assets so doesn’t pay capital gains tax. He keeps assets and uses them to buy his next asset and fund his lifestyle.
There isn’t a billionaire alive who would let the Dems take much of their income and if she starts taking wealth there won’t be many billionaires left in the country for long. And taxing millionaires won’t give her nearly the amount of money she needs. What she really wants (needs) is to tax EVERYONE 60+%.
The Swedish individual income tax rate is in that range and it starts at a very low level.
They have two brackets 30% and 60% plus 30% SS/Med.