You alluded to this, but in reality effective tax rates in the US are actually flat or even regressive due to the favorable tax treatment of investment income a

You alluded to this, but in reality effective tax rates in the US are actually flat or even regressive due to the favorable tax treatment of investment income as well as the massive deductions for property ownership: https://www.nber.org/papers/w20625 https://www.nber.org/papers/w20625