You already collect it all... it's called sales tax. Every business has implemented methods of collecting it, with the exception of a couple of states.
Read about the Fair Tax proposal for more information on how a consumption tax could (a) be implemented, and (b) be fair to all income levels.
However your point about exceptions is an excellent one.
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Re: Point 4: A "consumption" tax isn't practical.
You already collect it all... it's called sales tax. Every business has implemented methods of collecting it, with the exception of a couple of states.
Read about the Fair Tax proposal for more information on how a consumption tax could (a) be implemented, and (b) be fair to all income levels.
However your point about exceptions is an excellent one.