is the progressive tax system and the size formula which i believe is an economically theory-based system which is a regressive tax schedule you can see them down here where the u.s federal will be progressive means the more you earn the more percentage-wise you pay while the says formula will be regressive which generally means the more you earn the less you pay i believe this was derived under some assumptions to be the optimal tax distribution and the ai economist will come will come to will come to this in in a second