What eCommerce Brands Get Wrong About Retail Media Measurement

Why It Matters

Inconsistent ROAS prevents accurate budget allocation, eroding ROI for eCommerce marketers. A unified measurement framework restores comparability, enabling smarter spend across retail media and other channels.

Key Takeaways

• 63% ROAS variation stems from 11 differing methodology variables
• Brands use average six retail media networks, amplifying data fragmentation
• Only 15% of brands feel confident in retail media measurement
• Independent measurement applies uniform attribution, reconciling network reports
• Misaligned ROAS leads to misguided budget shifts and lost revenue

Pulse Analysis

Retail media’s closed‑loop measurement was built for a single ecosystem: each network leverages its own first‑party data, attribution windows and conversion logic to prove that an ad drove a purchase. This design delivers real‑time, purchase‑level insight that most digital channels lack, making it invaluable for brands seeking direct response. However, the very siloed nature that provides that clarity also means the data cannot be compared across platforms, leaving marketers with isolated dashboards that speak different languages.

A 2026 study uncovered a 63% fluctuation in ROAS calculations across networks, driven by eleven distinct methodological choices—from attribution window length to how halo effects are counted. Coupled with the fact that brands, on average, engage six retail media networks, the result is a fragmentation tax that multiplies inconsistencies. The 15% confidence rate reported by marketers underscores how these divergent metrics erode trust and lead to budget reallocations based on incomparable numbers rather than true performance.

The remedy lies in an independent measurement layer that imposes a single attribution framework across all networks, much like the signal‑governance standards pioneered in mobile performance marketing. By ingesting raw conversion data and applying uniform logic, brands can transform siloed ROAS figures into a reconciled, portfolio‑wide view. This not only restores budgeting confidence but also aligns retail media with the broader omnichannel mix, allowing marketers to optimize spend holistically rather than chasing isolated dashboard wins.