"Did you see the chart? That's what the empirical data shows."
It doesn't show any such thing. The whole truth is that from 1940 to 2000 average taxes paid including state and local went from 18% to 32%. Plenty of governments around the world and a number of US states are over 20% in federal taxes alone.
"Tax avoidance behavior increases as tax rates increase, you have moving targets."
This is obvious but, unfortunately, does not get you to "it's impossible to collect more then 20% federal taxes"
It doesn't show any such thing. The whole truth is that from 1940 to 2000 average taxes paid including state and local went from 18% to 32%. Plenty of governments around the world and a number of US states are over 20% in federal taxes alone.
"Tax avoidance behavior increases as tax rates increase, you have moving targets."
This is obvious but, unfortunately, does not get you to "it's impossible to collect more then 20% federal taxes"