Disregarding the misleading headline, it is overall a tough problem to define if and how to tax wealth. Most people would agree that applying a blanket tax on unrealized gains is problematic (since it would force you to sell to pay for gains), but at the same time most people also agree that having $100B in TSLA/AMZN stocks and borrowing against those assets while paying less taxes than people in the $5M income brack…
It would require tracking everyone’s expenses on a federal, or even global level. But then you can really redistribute wealth based on how “richly” someone is living. And also tax them proportionate to their consumption, which kills two birds with one stone. And you don’t have to worry about borrowing against assets to sidestep income taxes.
First $50k you spend is at x% sales tax, next $50k is at x+y%, and so on.