Somewhere in the last few years, the supermarket discovered it was sitting on a goldmine, and the goldmine was you. Not your groceries — your data, your attention at the digital shelf, the precise, loyalty-card-verified knowledge of what you actually buy versus what you tell surveys you buy. Retailers looked at this, looked at the brutal single-digit margins of selling actual food, and had a revelation: why sell tomatoes when you can sell ad space next to tomatoes at a 70-plus percent margin? Thus the retail media network — the fastest-growing, least-discussed, and arguably least creative frontier in all of advertising. Your receipt is now ad inventory. Congratulations.
The Quiet Trillion-Dollar Land Grab
Let’s anchor this in fact, because the scale is genuinely staggering and easy to miss. Amazon’s advertising business is now the third-largest ad platform in the world, behind only Google and Meta — by recent reporting, an annualised business north of $50 billion. It is, functionally, an ad company that happens to ship parcels. Following its lead, Walmart Connect, Kroger Precision Marketing, Target’s Roundel, Instacart, and roughly every retailer with a loyalty programme have launched their own networks. Industry estimates from analysts like eMarketer put US retail media ad spend well past $50 billion and climbing toward $100 billion within a few years, with global figures higher still. This is not a niche. It’s the third great wave of digital advertising, after search and social — and it arrived almost silently, dressed as “sponsored products.”
The driver is brutally simple economics. A grocer makes pennies on a tin of beans. It makes dollars on the ad slot the bean company buys to sit above the rival beans. Retail media margins are reportedly in the 70-90% range — closer to a software business than a supermarket. For a sector that has spent a century fighting over half a percent of margin, this is not a side hustle. It’s the new core business wearing a grocery apron.
Why Retailers Suddenly Love Margins They Didn’t Earn
What makes retail media irresistible to retailers is the same thing that should make marketers nervous: it’s almost pure leverage. The retailer already has the customers, the data, the screens (in-app, on-site, and increasingly the literal screens in the aisle), and — crucially — the purchase data to “prove” the ad worked. They built none of this for advertising. They built it to sell groceries, and then realised the exhaust fumes were more valuable than the engine. Every brand that wants to be found on the digital shelf now pays rent to the landlord who controls the shelf. And the landlord sets the rules, the prices, and the ranking algorithm.
If this dynamic sounds familiar, it should. It’s platform dependency wearing a new coat. Brands spent a decade learning the hard way what happens when you build your whole strategy on rented land — Facebook reach, then Google’s whims — and the algorithm changes overnight. Retail media is that lesson, repackaged and sold back to the same people who just finished paying tuition. The shelf is the new feed. The retailer is the new Zuckerberg. And “buy more ads or disappear from search results” is the new “boost this post.”
The Walled Garden Gets a Loyalty Card
Here’s the part the conference keynotes won’t dwell on: retail media networks are the most fragmented, walled-garden mess in modern marketing. Every retailer has its own platform, its own metrics, its own self-reported “we definitely drove that sale” attribution, and its own incompatible dashboard. Want to run a campaign across five retailers? That’s five logins, five definitions of a “view,” five sets of numbers that will never reconcile, and five account managers explaining why their network outperformed the other four. It is the cookieless future‘s revenge: just as third-party tracking died and everyone panicked about measurement, the retailers showed up offering first-party purchase data — at the price of total dependence and zero portability.
The grim comedy is that retail media solved the wrong problem beautifully. Marketers wanted to know whether ads work. Retail media gives you exquisite proof that someone who saw an ad next to the product also bought the product — which is correlation dressed in a lab coat. The person scrolling to the toothpaste was, on some level, already going to buy toothpaste. The network takes credit anyway, because it controls both the ad and the measurement of the ad. Marking your own homework has never been so well-funded.
The Measurement Mirage
This is where the insurgent marketer has to stay awake. Retail media’s killer feature is “closed-loop attribution” — the ability to tie an ad impression directly to a purchase, using the retailer’s own till data. It sounds like the holy grail. It is, frequently, a mirage with a great dashboard. The attribution windows are generous, the incrementality testing is optional and rarely done, and the network has every commercial incentive to credit itself for sales that would have happened regardless. You are paying for ads and for the report that tells you the ads worked, produced by the same company, with the same self-interest, and presented as objective truth. If a vanity metric ever wore a suit and got an MBA, this is it — a close cousin of every vanity metric we’ve ever mocked, except this one comes with a procurement contract.
What the Insurgent Marketer Actually Does About It
Retail media isn’t going away, and pretending otherwise is a great way to lose distribution. If you sell anything on a shelf, digital or physical, you will pay this tax. The question is whether you pay it like a hostage or a strategist. The strategist demands incrementality testing — real holdout groups, not self-reported attribution — and treats every network’s numbers as a sales pitch until proven otherwise. The strategist refuses to let “we have to be on the network” become a substitute for having a reason anyone would choose the brand off the shelf in the first place. Because retail media optimises the last three centimetres of the purchase; it does nothing for the brand that earns the choice before the customer ever opens the app.
And that’s the real risk hiding inside the trillion-dollar land grab. When every brand pours its budget into out-bidding rivals for the sponsored slot, marketing collapses into an auction — a race to rent attention by the click, with no one building the kind of brand that makes the auction unnecessary. It’s always-on marketing taken to its logical, joyless conclusion: spend forever, build nothing, and rent your own customers back from the shop that sells them to you. The networks will be fine. The brands that forgot how to be memorable will be a line item in someone else’s margin.
The Aisle Is the New Algorithm
To see where this ends, watch the physical store catch up to the app. The screens are arriving — on shelf edges, on the freezer doors, on the self-checkout you’re trapped in front of while it accuses you of an unexpected item. Each one is ad inventory waiting to be sold, and each one is governed by the same logic that turned your feed into a slot machine. The supermarket is becoming a media channel that occasionally dispenses food, and the brands stocking it are discovering that visibility — the most basic thing a product needs — is now a recurring fee rather than a function of being good or being chosen.
The deeper shift is psychological, and it should worry anyone who still believes marketing is a creative discipline. When the only lever that reliably moves sales is “bid higher for the slot,” the skill set quietly mutates from persuasion to procurement. The talented people stop asking “why would anyone love this brand?” and start asking “what’s our cost-per-click on the category landing page?” Both are real jobs. Only one of them builds something that lasts longer than the campaign budget. The retail media networks would very much prefer you forget the difference, because a brand with genuine pull doesn’t need to rent quite so much shelf — and a brand with none will pay the rent forever.
Refuse to become inventory. The NoBriefs shop is for marketers who still believe brands should earn the choice, not just rent the shelf — KPI Shark for the attribution theatre, Spreadsheet Sloth for the five irreconcilable dashboards, and Fuck The Brief for everything else. Join the insurgency →
