It's not an effective tax rate, it's an absurd parody of an effective tax rate.

If that $5 of ""income"" is actually capital gains, then it won't be taxed very highly, and adding another 20% is fine. The discussion of 37% + 4.5% + 20% is misdirection.

If that $5 is honest to goodness income, then on average you're also getting $5 of unrealized capital gains, which means you're not paying $2 on $5, you're paying $2 on $10. Or maybe you realize part of the gains and you're paying somewhere between $2 and $3 on $10. A much smaller impact, and that's only if someone in a medium tax bracket with 20x their income in wealth is even affected by the wealth tax at all.

But when you liquidate assets you... pay tax! Capital gains tax. So you liquidate, pay capital gains, and use the proceeds to pay a wealth tax?