"... the after-tax wealth spent by the upper income levels goes toward reinvestment in businesses that create and maintain jobs and payroll for those 'working their way up' ..."
That may be true whatever the percentage, but that reinvested wealth is not taxed under the FairTax nor - unlike the income tax - is the income from it. So all in all the FairTax is clearly the preferable system as shown by your quote.
but that reinvested wealth is not taxed under the FairTax nor - unlike the income tax - is the income from it.Yes it is, it's taxed when it's spent and it's entire value, not just the interest, is reduced because of the sales tax.
You can look at your savings or you can sit and count it but it has no value untill you spend it and that is exactly when it loses it's value under the Fairtax scam.