1) Figure how many times poverty rate you make in revenue (2x, 3x, whatever)
2) Take the log base 10
3) Multiply by some flat constant that is the same for everyone, so that the total national amount taxed is how much the US needs. Last I checked, that flat constant would be around 9.
4) The result is what percentage of your revenue you should pay in taxes.
Currently, we are far from logarithmic. Under this scheme, pretty much everyone reading this board would pay less taxes. Bill Gates pays about the right amount. Exxon would pay more.
Useful as a thought experiment to explore how far away we are from a fair level of progressive taxation.