More gobbledygook. You have such a clear and lucid writing style, a_g.
With the exemption of business purchases from the FairTax, the problem of proving business use for deductibility is not going to be improved one bit. It might be much worse.
Or to put it in geezereze:
The resultant cost vector formulation of quasi-business equivalences shall show the potential for serious cross-tabulations into semi-personal expenditure ranges when accounting analyses are undertaken; however additional layers of provenance could indeed morph the nominally more simplistic FairTax structure into a bestial abomination.
the problem of proving business use for deductibility is not going to be improved one bit. It might be much worse.
Since there is no deduction from revenue receipts for business use to determine the tax collected from customers your statement is a non-sequiter under a retail sales tax system.
Business is exempted from paying the tax to begin with, deductibility does not even enter into the determination of tax collected and thus remittable to the state tax adminstration.