Every retailer sells ads now. Proving they worked is your job

Why this channel matters

Retailer ad networks are the fastest-growing major ad channel: retailers monetizing their shopper data on and off their sites. Brands keep raising budgets — and keep asking the uncomfortable question: did the ads create sales, or take credit for them?

The questions clients actually bring us

• Incrementality: New sales, or the same sales relabeled?
• Off-site targeting: Does retailer data work when the ad runs elsewhere?
• Non-endemic fit: Should a bank or airline buy a grocer's audience? Sometimes — test it.
• Overlap: How do three retail media buys interact inside one media mix?

How to measure it properly

Controlled tests: exposed-vs-control cells, matched markets, holdouts — on sales and on brand metrics. Sales data says what happened; survey data says whether anyone will remember you next quarter. You need both before renewing a seven-figure retail media line.

Where it's heading

Consolidation, standard metrics, and buyers demanding independent proof. Research teams that can run incrementality tests and tie sales data to attitudinal tracking will stay busy.