The problem is at the advertising level.

Could your local Safeway put tax-inclusive prices in the circular? Sure, although there are actually laws that prohibit such local pricing (YMMV; I've lived in a lot of states) specifically so that people in the sticks aren't shouldering the entire transportation bill to their IGA. This is why grocery circulars are regional, but that's an aside. Still, different cities in the region will have different tax rates, so they can't do tax-inclusive, and they certainly can't have a different price on the shelf than in the circular, and here we are.

But these are small potatoes.

Now, can Tim Cook release a new iPhone and list the price in every municipality in the U.S. in the keynote? The patchwork of devolved taxing authority makes the U.S. a poor candidate for tax-inclusive pricing.

States universally abandoning income tax for VAT (ain't never gonna happen, since VAT inconveniently hits even billionaires' consumption [and even less likely would be pushing through VAT while retaining income tax]) could get things closer to what Europeans have come to expect, where each state would have a universal rate and consistently applied carveouts and then distribute that to lower tiers of government as some states currently do with sales tax, but the closest advertising could get to that would be "state VAT excluded," at which point nothing has been fixed in terms of walking out the door paying the advertised price at the cost of unpopular economic upheaval.