That's one of the main reasons why a 21% sales tax would never work. You want to complain about high taxation on corporations and the rich but don't mind implementing a system where the poor would be systematically destroyed. 21% of the poor's income and 21% of the rich's income are not even nearly the same.
So for you to say they would be hit just as hard is such a pathetic joke that I can't even laugh at how stupid it is.
It's even worse than that. Poor people spend a much higher percentage of their income, so the effective rate paid by the poor would be significantly higher.
good incentive to SAVE
Without getting in to the negative economic impact of a huge shift toward saving, it's also worth noting that it's not practical. Someone making 20k a year doesn't have any other choice but to spend the vast majority of their income.

Never a dull moment with you Willow.