Retail Media Networks (RMNs) have quietly become one of the most powerful forces in modern advertising. By giving brands access to retailers’ first-party shopper data, they allow advertisers to reach consumers right now they are ready to buy. The momentum behind them is hard to ignore. U.S. advertisers spent $60.32 billion on retail media in 2025 and are on pace to spend $71.09 billion in 2026, according to EMARKETER, with growth outpacing both social and search advertising. Globally, retail media has become a $175 billion channel, already surpassing total TV advertising and accounting for over 15% of all ad spend worldwide. 

But growth alone does not tell the full story. Underneath the impressive numbers lies a persistent and growing problem: brands are spending more on retail media than ever before, yet many still cannot confidently say whether their campaigns are working. 

The Measurement Problem 

The core issue is fragmentation. Advertisers today work across an average of six retail media networks, a number projected to reach eleven by the end of 2026, with each network operating as its own walled garden with different data, metrics, reporting systems, and ways of working. This is not a temporary phase the industry will grow out of. It is structural, because every retailer is, by definition, its own closed ecosystem. 

The result is a crisis of confidence. Only 15% of brands report strong confidence in their retail media measurement. The main challenge is not the absence of tools or data, but the lack of a shared language. Amazon measures performance at the SKU level, Meta by audience, and Google by keyword, each with different attribution windows and definitions. Without standardization, brands end up debating numbers instead of making decisions.

Transparency and Trust 

Even when data is available, it is not always trustworthy. Many RMNs still rely heavily on Return on Ad Spend (ROAS) as their headline metric, without offering visibility into whether their campaigns actually drove new sales or simply captured purchases that would have happened anyway. Metrics vary across networks, transparency is often limited, and advertisers have not always had clear insight into how their retail partners define success. 

Incrementality testing, which attempts to isolate the genuine causal impact of advertising, remains the gold standard that most brands aspire to but few can access at scale. 86% of commerce media decision-makers in North America and Europe say that strengthening measurement and attribution to better prove ROI is a high or critical priority for the year ahead, according to research from Koddi and Forrester Consulting. 

The Case for Independent Measurement 

Because RMNs effectively grade their own homework, the demand for neutral, third-party measurement has never been stronger. In 2026, measurement is getting standardized through independent verification rather than retailers self-reporting results. Independent measurement partners bring something the platforms themselves cannot: the absence of a financial stake in the outcome. Their role is simply to show what happened. 

In a landscape where retailers control data access and standards vary widely, advertisers are increasingly turning to neutral measurement partners for unbiased insights, seeking a more complete view of advertising effectiveness rather than relying solely on retailer-side data. 

Real-Time Data Remains Out of Reach for Most 

The ability to act on data mid-campaign is what separates brands that optimize in real time from those that read a report after the damage is done. Yet access to in-flight performance data remains limited across the industry. The shift brands need is not better post-campaign reporting. It is infrastructure that steers decisions while campaigns are still running, moving from asking “did this work?” to asking “what should we change right now?” 

Three quarters of U.S. advertisers plan to increase their retail media budgets in 2026, but many are doing so without the real-time visibility needed to spend confidently. 

The Path Forward 

The solution is not a single fix. It requires collaboration across retailers, brands, agencies, and third-party measurement providers. In an IAB study, 62% of ad buyers pointed to standardization as a top growth challenge, and momentum toward shared industry standards is building. As AI and machine learning give networks the ability to build more sophisticated measurement tools and self-service options expand, advertisers are getting closer to measuring performance in the ways that matter most to them. 

The brands that will come out ahead in 2026 are those investing now in the infrastructure to manage campaigns across networks from a single, standardized view, rather than waiting for the industry to solve the problem for them. 

Partner with Paragon Digital Services 

At Paragon Digital Services, we understand the real-world complexity behind these challenges. Our expertise in digital operations, data governance, and compliance makes us the right partner for brands looking to bring order to their retail media programs. We offer end-to-end campaign management, cross-platform reporting, and compliance tracking built around accuracy and accountability. Our ISO-certified processes and highly trained team are designed to deliver clean, reliable work at scale, so your team can focus on strategy instead of reconciling spreadsheets.