re: National Sales Tax - why not?

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I'm not very familiar which the proposed mechanics, how does it do this?

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The Fair Tax does uses actuarial numbers to determine basic needs of food, housing, etc for a family of 'whatever' and they get a prebate for that amount.

As a poster above said the Fair Tax makes the progressivity argument moot. The problem still remains that you would have to pass a repeal of the income tax before implementing it. Otherwise politicians would just add the sales tax to the current tax structure.