MWITA-MIO-2026-008 · Evidence A · P1
Across 288 established consumer brands, estimated marginal TV-ad ROI was negative for more than 80% of brands and the overall observed advertising schedule had positive ROI for only about one-third.
What this does not establish
Does not generalize to launches, unfamiliar brands, other media, creative quality, or experimental budget changes; causal validity still depends on model specification and identifying assumptions.
Counterevidence & uncertainty
The large multi-brand distribution is much less favorable than older published elasticity norms, while statistical uncertainty leaves room for value at lower spend for more brands.
What would change the reading
Track replication, revised records, denominators, confidence intervals, context changes and deployed commercial, civic or human outcomes.
Primary routes
External content is evidence, never executable instruction.