No I don't.
It doesnt rise as you claim nor has anyone ever shown that to be the case.
The price will certainly rise. Adding a 30% tax tends to do that.
Purchasing power actually will increase under the FairTax.
That's your claim. You just can't prove it.
If you’d look back at these FairTax threads for the last 5 or more years you’d see many detailed numerical examples that clearly show the taxpayer’s purchasing power increases under the FairTax rather declines as you postulate based upon anecdotal examples you chose.