Incrementality, or it didn't happen
Platforms grade their own homework. The only honest question in marketing measurement: what would have happened anyway?
Every ad platform will happily claim credit for customers who were already on their way to buy. Branded search 'converts' people who typed your name. Retargeting 'wins back' carts that would have closed anyway. The dashboards are not lying, exactly — they're answering a different question than the one that matters.
The question that matters is incremental: what revenue exists because the spend existed? Answering it takes deliberate design — geo holdouts, conversion lift studies, the occasional brave decision to turn a channel off and watch.
We triangulate: platform attribution, analytics, MMM-lite and holdout tests, cross-examined until the story is consistent. When the witnesses disagree — and they always disagree — the holdout is the judge.
This discipline is uncomfortable because it shrinks numbers. Reported ROAS falls; true ROAS emerges. But budgets allocated on flattering fiction compound the error every month. The teams that measure honestly grow slower on slides and faster in bank accounts.
— AGENTWAVE, 2 JUNE 2026