I was just wondering if large stores just leave it to chance and probability that they won't accidently end up with a winter coat and a tennis racquet with the same code, or if there is some centralized process involved. Particularly if the same computer program is used to generate codes simultaneously in two locations.
There is what amounts to a bar code registry - but foreign manufacturers do not play by the game. The UPC convention is only in US and Canada. So there is duplication.
Plus, all stores have the option of generating their own in-house UPC - as long as the UPC starts with a 2.
Ever see a box with several UPC's or one with another UPC label slapped over another?
Ever bring a box up to a register and find that the register cannot figure out what it is?
The PLU fails because the UPC has not been entered into the local store's system.
In other words, it is not a "unviersal" barcode.
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