Comment by drdec
1 day ago
They are talking about the price on the shelf vs the price at the register. The price tag on the shelf has information identifying the product. The price at the register is obviously associated to the bar code on the product. So there's no way for a consumer to swap price tags from one product to another.
Source - worked at a grocery store in Massachusetts as a teen
I was being colloquial by referencing the pre-scanner way of doing it, but since this article is all about changing the shelf tag, it seemed relevant.