The Maze: Retail media is supposed to be the retailer's revenge on Google and Meta. The reality looks more concentrated. EMARKETER's 2028 US forecast puts Amazon at $75.45B in retail media ad revenue, still growing 16.2% a year. Walmart is far smaller at $9.30B, but grows fastest at 22.3%. The 60-plus smaller networks grouped as `Other` reach $5.84B and grow only 9.7%. The long tail is not catching up. It is getting priced into a smaller lane.
Scale compounds twice. Amazon already has the largest ad base in the forecast, and its 16.2% CAGR still beats the 9.7% long-tail group. That matters because retail media is not just ad inventory. It is shopper traffic, transaction data, closed-loop measurement, seller demand, and enough conversion volume to convince brands that the signal is real. Smaller networks may own useful audiences, but they often lack enough reach and proof to win default budget status.
Walmart is the clean challenger, not the average peer. Walmart's projected $9.30B is only a fraction of Amazon's $75.45B, yet its 22.3% CAGR makes it the fastest named player. That fits the operating story. Walmart's global advertising business grew 37% in its latest reported quarter, while Walmart Connect U.S. grew 44% excluding Vizio. The company has grocery frequency, store visits, ecommerce demand, and a growing services layer. That is a better retail media machine than a banner ad pasted onto a retailer's website.
The middle is the problem. Target at $1.51B and 18.2% growth looks healthy. Kroger at $1.34B and 15.6% is credible. eBay, Etsy, and Macy's sit lower on the growth curve. The issue is not that every smaller network is weak. The issue is that the category has too many sellers of similar promise: first-party data, shopper context, and measurable outcomes. Buyers can believe that story and still consolidate spend into the few networks with the strongest proof.
France points to the same operating logic. The LinkedIn post frames the French market as growing around 16%, with Amazon France around 21%. That specific French comparison needs its underlying source, but the mechanism is familiar. Brands put money where traffic, sales volume, and return-on-investment proof sit together. Lawrence Taylor's comment thread sharpened the point: mid-sized players should stop trying to be smaller Amazons and build differentiated offers. Valiuz and Carrefour were cited as examples of full-funnel differentiation.
Retail media is becoming a proof market. When budgets tighten, advertisers do not only ask where ads can run. They ask where spend can be tied to sales. IAB's 2025 outlook still projected retail media growth even while cutting the broader US ad forecast. Walmart's ad leadership is already talking about ads inside shopping assistants as contextual, not interruptive. The next battleground is not more ad slots. It is cleaner attribution, better shopper intent, and enough scale to make the math obvious.
Why it matters: Retail media is not flattening the ad market. It is rebuilding the platform hierarchy inside commerce. Amazon has the gravity. Walmart has the challenger momentum. A few retailers can win by owning a category, audience, or data partnership that advertisers cannot easily buy elsewhere. Everyone else risks becoming a nice media story with no budget leverage. Go big or go niche is not a slogan. It is the operating model.
Sources: LinkedIn post | Walmart Q1 ad growth | IAB ad-market context
