Search for a common household item on a major retailer's app and the top few results are almost never the cheapest or best-reviewed option. They are labeled, faintly, as sponsored. A shopper scrolling past them assumes this is just how search works now, the digital equivalent of an end-cap display.
What they are actually looking at is, in fact, the most profitable line of business the retailer runs, tucked inside a shopping experience that looks, at first glance, like ordinary retail.
Retail media is the practice of a retailer selling advertising space on its own website, app and search results to the brands that already stock its shelves. A shampoo brand pays to appear above a rival's shampoo when a customer searches the word "shampoo," and a snack company pays to show up on the product page of a competitor's chips. A retailer running this business is no longer only a merchant buying goods low and selling them high. It is also a media company. It rents out attention it already owns.
Economics explain why this business grew so fast without most shoppers noticing. Selling a bottle of shampoo involves buying inventory, storing it, shipping it and absorbing the risk that it doesn't sell, all for a thin margin, while selling an ad slot on the page where that shampoo appears involves none of that. There is no inventory to warehouse and no unsold product to write off. As a result, a large share of every ad dollar flows straight to profit. That's unlike the wafer-thin margins that define selling physical goods.
What makes retail media especially valuable to advertisers, and therefore lucrative for retailers, is the data sitting underneath it. A retailer can see not just that someone saw an ad, but whether that same shopper actually bought the product minutes or days later on, using the store's own checkout records. Advertising elsewhere on the internet mostly requires inferring whether a campaign worked. Advertising inside a retailer's own store lets the retailer show, with its own sales data, that it did. That closed loop between exposure and purchase is what brands are really paying a premium for.
This money comes overwhelmingly from the consumer brands that supply the retailer's shelves. It is layered on top of arrangements that already existed. Brands have long paid retailers for favorable shelf placement and promotional slots, a practice retailers call trade spend. Retail media absorbed much of that budget and gave it a digital, measurable form. A brand that once paid for an end-cap now pays for a sponsored search slot. Often, it's the same retailer. That slot frequently costs more than the shelf placement it replaced.
This arrangement creates a bind for the brands paying into it.
Once enough competitors buy sponsored placement in a product category, declining to participate does not preserve a level playing field. It means a brand's own products sink beneath paid listings from rivals, becoming harder for shoppers to find even when they searched for that brand by name. Functionally, this looks less like optional marketing and more like a toll for continued visibility in a store the brand cannot easily avoid, especially if the retailer commands a large share of the category's sales.
Retailers, in turn, face a temptation. It runs against their original business. Every additional sponsored slot on a search results page is close to pure profit. But it also pushes the organic, most-relevant result further down the screen, which can make it harder for a shopper to find what actually best matches their search. A retailer earning a growing share of its profit from advertising has less incentive to worry about that erosion. That holds so long as shoppers keep buying something on the page, even if it isn't the item they were originally looking for.
This same dynamic is pushing retailers further. They're expanding retail media beyond their own websites.
Having built the audience and purchase data, several large retailers now sell access to that data and audience for ads that run elsewhere, on other publishers' sites and apps, functioning much like traditional ad exchanges. This turns the retailer into something closer to a media and data company that happens to also sell groceries or electronics.
Its store becomes one distribution channel among several for an advertising business that can operate independently of it.
For this to change, one of a few pressures would need to bite. Brands, particularly smaller ones without the scale to negotiate favorable ad terms or absorb the cost, could push back collectively. They could also shift spending toward channels with clearer, independently verified returns, rather than metrics the retailer selling the ads also controls. Regulators are examining how sponsored content is disclosed, and whether the largest retail media sellers are also gatekeepers with outsized power over which products shoppers can even find. That scrutiny could impose new disclosure or fairness rules. And if search results grow cluttered enough that shoppers routinely go elsewhere to compare prices or discover products, retailers would eventually face a choice. They would have to weigh short-term ad revenue against the risk of losing the shopping traffic that ad revenue depends on.
None of those pressures are near forcing a reversal. Incentives on every side of the arrangement agree on this. They still point the same direction.
Retailers report retail media as their fastest-growing, highest-margin segment. They have every reason to expand it. Large brands with marketing budgets built around it have made peace with the cost and often pass it along in the prices they charge. Smaller brands and challengers, who have the least power to negotiate favorable terms, bear the heaviest relative burden and the greatest risk of being pushed out of visibility altogether.
What is worth watching next is how retailers choose to talk about this business as it matures. Watch whether retail media growth decelerates as it approaches the ceiling of available ad inventory on a finite number of search pages. That would force retailers to either expand more aggressively off-site or accept slower growth in their most profitable segment. Watch how regulators and disclosure rules evolve around sponsored placement, especially whether "sponsored" labeling becomes more or less conspicuous as the ad business grows. Watch smaller consumer brands' margins and market share too. Early signs there will show whether the price of staying visible in retail search is becoming a genuine barrier to competing at all.