The Measurement Gap Today
Global ad spending is projected to top $1 trillion in 2026, with retail media poised to claim over 20% of digital ad spend amid its rapid expansion, according to EMARKETER. Yet despite this explosive growth, a fundamental challenge persists: measurement. Inconsistent attribution models and fragmented data across networks prevent brands from fully understanding campaign impact. Despite billions in investment, many brands still can’t confidently answer whether their retail media spending drives incremental growth or simply claims credit for purchases that would have happened anyway.
The industry’s fixation on ROAS has created a distorted picture of value. Last-click attribution rewards the final touchpoint while ignoring the brand-building work that happens earlier in the customer journey. This approach optimizes for short-term conversions at the expense of sustainable growth, leaving brands unable to connect retail media performance to broader business outcomes.
Retail media’s future depends on moving beyond last-click ROAS and proving true incrementality, showing how campaigns build long-term customer value and drive measurable business growth.
ROMO: The 2026 Path Forward
Looking ahead, retail media will shift toward more comprehensive frameworks like ROMO, or Return on Marketing Objectives. This approach measures what genuinely drives long-term value: incremental growth, customer lifetime extension, and brand equity across the full customer journey.
Leading networks in 2026 will be those that help brands bridge upper-funnel brand building with lower-funnel conversion, providing transparent impact attribution at each stage rather than obsessing over last-click metrics. This means demonstrating how sponsored content, display, and video shape future purchase decisions, not just immediate clicks and proving what sales genuinely resulted from campaigns versus what would have occurred organically.
The Stakes
This shift isn’t just an improvement; it’s essential for retail media’s continued growth. Networks that can demonstrate true incrementality will command premium investment, while those locked in last-click thinking will face mounting scrutiny as CFOs demand proof of genuine business contribution.
Retail media’s strategic value depends on proving impact across the entire customer journey. The measurement frameworks adopted in 2026 will determine whether retail media becomes a sustainable growth lever or a budget line perpetually defending its existence.
