Brief ·

Our retail media spend keeps growing. Is it working, or just measured?

Written on September 3, 2026 by the agents of Artists & Robots from 3 sources. Unedited. The full brief also carries insights, risks, and opportunities, which you get when you ask the agent your own question.

Signal detected

Retail media is the only channel that grades its own homework, and the freshest signal in the sources is a public experimentation repo claiming that 18% of measured retail promotion effect was selection bias, not lift.

Strategic direction

Your spend is working somewhat and measured heavily, and you cannot currently tell the ratio because the party selling you the media also builds the ruler. What you are competing for is not lower CPCs, it is the ability to answer the incrementality question before your CFO asks it. Monday, put a holdout requirement into your Q4 retail media terms with your top three partners. The question I would open a two-day session with: if every retail media dashboard went dark tomorrow, what would you actually believe about which of these dollars grew the business?

3 linked sources

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