Two shoppers can take the same box off the same shelf and pay different amounts, depending on whether an offer was loaded to a loyalty account first. The split is intentional.
The shelf tag stopped being one number
Chains have shifted promotions from printed circulars to account-linked offers that must be activated before checkout, usually in an app or on the store's website.
The tag on the shelf then shows a base price alongside a lower conditional price, with the condition being membership and activation rather than quantity.
Nothing about the product differs. The variable is whether the store can attribute the purchase to an identified household.
Identification is what the discount buys
An anonymous transaction tells a retailer what sold. An identified one tells it which household bought it, how often, and what else moved with it.
That record supports targeted offers, restocking decisions and negotiations with suppliers who want to reach specific buyer groups.
The discount is therefore payment for data, which is why it is withheld from shoppers who decline to be identified.
Activation friction is a feature
Requiring an offer to be clipped in advance guarantees that some eligible shoppers will forget, and those shoppers pay the higher price.
The store gets the advertising benefit of the low number on the shelf while paying it out on only a portion of the units sold.
Breakage of this kind is predictable enough to be planned for, which is part of why the advertised discounts can be as deep as they are.
Manufacturer funding sits underneath
Many grocery promotions are funded by the brand rather than the retailer, through trade allowances negotiated well in advance of the week they run.
Brands prefer targeted digital offers because they can be aimed at households currently buying a competitor, which a paper coupon cannot do.
This is why offers on major packaged brands appear inconsistently between accounts while store-brand prices stay the same for everyone.
What it means for a shopping trip
Comparing chains on advertised prices alone becomes unreliable, since the advertised price may be one that most shoppers in the store are not paying.
Households without a smartphone or a store account are structurally excluded from the lower tier, which is a growing concern for consumer advocates.
The practical response is to treat activation as part of making the list, because after checkout the price is settled and the offer cannot be applied retroactively.