Pyro, the essence of the Fair Tax is that people who live at or below the poverty line would not be taxed, period. And without an income tax eating half their wages they would have more discretionary income. Also, all purchases above poverty level are taxed, which means that if millionare A buy a $800,000 dollar yacht or a ferrari or something, and the tax rate is 10%, that purchase will be taxed $80,000 for a total purchase price of $880,000.
IE, the more extravagant you're lifestyle, the more tax you pay, the more you scrape by the less tax you pay.