Experimentation Replaces Tracking As The Evidence Standard
A controlled holdout answers whether advertising caused an outcome, which no amount of observational tracking can establish once identifiers are unavailable. Media mix modelling and incrementality testing grow at 16.8% on that logic, and the adoption gap is enormous: only 17% of campaigns are validated experimentally today. The barrier is organisational rather than technical, since running a holdout means deliberately withholding advertising from some customers, and the person who has to approve that is usually the one whose targets depend on reach. Vendors who help navigate that internal conversation win the account.
Market Impact: Covers 4 major jurisdictions








