For twenty years the open web sold attention and inferred intent. Retailers already had the receipt. Once they built the pipes to auction that receipt back to brands — onsite search ads, offsite audiences, in-store screens — a new media company appeared inside companies that used to think of themselves as grocers and category killers.
This is why retail media keeps taking budget from both linear TV and the old display stack. Attribution is not a science experiment when you can see the cart. Brands will overpay for a clean story. Retailers will take the overpay and call it high-margin revenue, because it is.
The product is the closed loop
Onsite sponsored search is the core: high intent, ugly creative, excellent conversion. Offsite is the land grab — using loyalty data to follow the shopper onto other apps. In-store is the slow build: screens, shelf labels, receipts. Each layer has different ops. Only the first is mature at most chains.
The strategic risk is concentration. If a handful of retailers become the default path to the basket, brand.com and the open web become a branding tax. That is already the conversation in CPG holding companies, even when the public numbers still look diversified.
The aisle was always media. We just started invoicing it like media.
What brands should demand
Incrementality, not last-click theater. Clean-room access, not a PDF of “insights.” A path to creative that is not ten SKUs fighting in a search box. And a hard look at whether the retailer is also a competitor launching a private label next to the ad you just bought.
Agencies that only know social auctions will struggle. The buying motion looks more like trade promotion plus programmatic, which is a sentence that should frighten anyone with a clean org chart.
The publisher lesson
Independent publishers cannot copy Walmart’s receipt. They can copy the discipline: first-party relationships, honest measurement, and inventory that is scarce enough to price. Retail media’s rise is a reminder that ads follow data gravity. If your site has no gravity — no habit, no identity, no reason to return — you will rent attention at declining rates.
That is the uncomfortable mirror for an ad-supported briefing like this one. The work has to be worth a habit. The rest is slots.