Comment by LargoLasskhyfv

> It doesn't really change anything.

> Previously, a criminal could just print their own shelf tags.

Between your 'previously' and now is a period of at least two or three decades, where shelf tags have only be for your information in the store, while the real price came from computerized POS-Terminals with attached barcode-readers. Which of the two has priority for the customer may depend on country, law, store policy & good will.

Furthermore stores are completely cam covered nowadays, so much luck with being seen fumbling with your gadget in front of that label, or being seen on 'tape' putting another one over it, or things like that :-)