There was/is an old scam where the store puts up a tag with a false low price and the UPC barcode scanner reports a different (higher of course) price and much like long distance cramming hope the customer doesn't notice.
If the store is falsely accused its simple to hold the receipt up against the paper label.
There are digital price labels but they're unidirectional protocol so every time a product comes off sale the store risks substantial trouble if the digital update protocol is merely 99.9% successful.
You'd need a successful bidirectional verifiable digital price tag system. It could be as simple as sweeping a very high resolution camera up and down the aisles.
If the store is falsely accused its simple to hold the receipt up against the paper label.
There are digital price labels but they're unidirectional protocol so every time a product comes off sale the store risks substantial trouble if the digital update protocol is merely 99.9% successful.
You'd need a successful bidirectional verifiable digital price tag system. It could be as simple as sweeping a very high resolution camera up and down the aisles.