Now pigdog will say the figure is bogus because the tax panel's mission was to preserve the income tax, while the FairTax three's motives are pure.
In addition, they made assumptions that there would be from 15 to 30% evasion to help boost the rate of the nNon-FairTax-ish plan they devised while having no information showing that to be a valid assumption at all. Under the FairTax, the act of buying the taxable item and receiving the receipt constitutes compliance in and of itself and beyond that no "evasion" is possible since the tax law would have been completely complied with at the point of purchase.
Theft of the government;'s tax money is a different sort of crime, but not "evasion". And it could be more easily dealt with than taxpayer evasion - which is the point of showing a small percentage of the retailers do a large percentage of he business.