Really? That's very interesting...
Things that have already been taxed are not taxed again. The working definition of "used" in this context is "already been taxed".
Take a look here for a few minutes.
>>> One thing about the sales tax is used goods are exempt, ...
Really? That's very interesting...
The FairTax legislation taxes all goods and services once but only once by design.
Used goods, are either assumed to be paid under the income/payroll tax system and grandfathered by the legislationl, or have been explicitly by collecting national retail sales tax on new products produced after the implemention date of the bill.