I have yet to pay sales tax at a flea market in VA where I have bought all the necessities of life: food, clothing, tools, etc.
So what is your paranoia over?
If the flea market seller remits the tax at some prior purchase before it is sold to you, no NRST is collected at sale to you except as he may demand a higher price from you to compensate himself for tax paid on those things he's selling.
If he's selling you servicable used goods, which clothing and tools often are at such markets, again no problem with NRST.
In any case tThe states will still be who administers the NRST.
H.R.2525
SPONSOR: Rep Linder, John (introduced 07/17/2001)
A bill to promote freedom, fairness, and economic opportunity by repealing the income tax and other taxes, abolishing the Internal Revenue Service, and enacting a national retail sales tax to be administered primarily by the States.
Refer: http://www.fairtax.org & http://www.salestax.org
The history of the use of retails sales taxes simply do not support your sky is falling view as your own statement provide evidence to.
I am at ease with the current system. Sales tax is low and the volume at the flea market is low enough for the tax collectors to ignore. Under an NRST, my understanding from this discussion is that the tax authorities will require wholesale purchases to be tracked. For example my sock vendor will be identified when he purchases the socks in L.A. and has them shipped here.
If the tax goes up, he will have an incentive to sell untaxed socks to me at a private sale. He might say he lost the sock shipment, he might have the socks made locally in a cottage, he might smuggle them through our busy ports. In any case the government will have a larger incentive to track all shipments of all merchandise at the wholesale level.
What could decrease my ability to purchase anonymously is the tracking technology and the "legitimizing" of vendors. I could easily foresee a day when the flea market is either shut down or patrolled with agents looking for "new" merchandise.