Yes, higher tax rate != more revenue. More economic activity does increase tax revenue. Simple, but confiscatory demotards never read Gibbon’s Decline and Fall of the Roman Empire and don’t realize or refuse to acknowledge that failing civilizations always increase the tax burden till economic activity lessens. Thereby, inviting further tax increases and further reduced revenues — death spiral.
Too bad the calculus did not exist in Rome’s day, not that they would pay any more attention to it than our dear Big Ears who said even high school math challenges him too much.