On an individual level maybe but the top two quintiles have made more money year after year regardless: https://www.taxpolicycenter.org/statistics/household-inc

On an individual level maybe but the top two quintiles have made more money year after year regardless: https://www.taxpolicycenter.org/statistics/household-income-quintiles https://www.taxpolicycenter.org/statistics/household-income-... It's not like the top echelons of earners have a bad year and GDP plummets or anything; I'm not sure what "volatility" means in this context as far as tax revenues but I can't imagine it results in huge variability or uncertainty.