> What makes me weary about any such tax is that in practice, it seems to target the broad middle class
If you're talking about the "Zucman tax" it explicitely targets the ultra-high-net-worth individuals because that's the population that manages to avoid income tax and thus pay a lower effective tax rate than the rest of the population.
If you're talking about the "Zucman tax" it explicitely targets the ultra-high-net-worth individuals because that's the population that manages to avoid income tax and thus pay a lower effective tax rate than the rest of the population.
source: https://gabriel-zucman.eu/files/report-g20.pdf