Is Retail Media Finally Becoming an Open Ecosystem? 

Is Retail Media Finally Becoming an Open Ecosystem? 

In “the exodus”, we looked at how retailers are moving away from legacy ad serving infrastructure, and why that shift is accelerating. Part two explored why most retail media programs stall before they reach meaningful scale. The through-line between both pieces is the same problem showing up in different forms: closed systems that were never built to grow. 

This piece is about what an open one actually looks like.

Retail Media's Closed Ecosystem

Retail media has spent the last few years growing rapidly, but also quietly fragmenting.

Every retailer built its own stack. Its own inventory. Its own demand. Its own rules.

Early on, that model made sense. Retailers wanted greater control over their data, their advertiser relationships, and the customer experience. Building a closed ecosystem allowed them to launch quickly and establish retail media as a new revenue stream.

In practice, however, that same model has also limited the very thing retail media is designed to maximize: competition.

Every retailer is responsible for attracting advertisers independently. Brands must manage campaigns across disconnected platforms, each with its own buying workflow, reporting standards, and optimization logic. Demand becomes fragmented, making it harder for retailers to maximize the value of their inventory and for advertisers to scale efficiently.

The industry is beginning to recognize that control and competition are not the same thing. Retailers don't necessarily create more value by keeping demand inside their own ecosystem. They create more value when every impression has the opportunity to attract the strongest possible competition.

The Shift Isn't Just Toward Openness

The more meaningful change is happening inside the auction.

Every sponsored placement is a marketplace decision. The auction determines which product earns visibility, which advertiser wins the opportunity, and ultimately how much value a retailer captures from its inventory. The quality of that decision depends on the quality of the competition taking place.

A closed auction can only optimize among the demand available within its own ecosystem. When more qualified demand sources are able to participate, the auction has access to better pricing signals, richer relevance signals, and more opportunities to maximize marketplace outcomes. Competition doesn't simply increase the highest bid. It improves the quality of every allocation decision.

That's the economic reason open ecosystems matter. They don't create value because they are open. They create value because they allow more demand to compete within every auction.

AI Makes Competition More Valuable

This dynamic becomes even more important as AI takes on a larger role in commerce.

Modern auction systems don't simply rank bids by price. They continuously evaluate bid values alongside shopper intent, predicted conversion, pacing, relevance, and long-term campaign performance. The more high-quality demand the auction can evaluate, the more effectively those systems can optimize for retailers, advertisers, and shoppers at the same time.

In other words, AI doesn't replace competition—it amplifies its value. Better competition gives AI better choices, leading to better marketplace decisions.

What an Open Commerce Ecosystem Looks Like

The next phase of retail media won't be defined by isolated networks competing independently. It will be defined by connected marketplaces where multiple demand sources can compete fairly within the same auction, while retailers retain control over their inventory, business rules, and customer experience.

That doesn't mean every retailer gives up ownership of its platform. It means creating an ecosystem where competition happens more efficiently, AI has better information to work with, and every auction has the opportunity to maximize value.

Retail media was built in an era of closed platforms. Commerce AI is driving a shift toward more open ecosystems, but openness isn't the destination. Better marketplace decisions are.

Because at the end of the day, retailers don't win by limiting competition. They win by creating auctions where the best opportunity can emerge every time.