That news come from The Local Search Association which released a white paper detailing how billions of dollars of co-op advertising dollars go unclaimed every year. Over 40% of small businesses sell national brands that could qualify for co-op. Confusing rules about how to use co-op is a major reason the funds go unclaimed. When asked which media uses co-op funding the most, advertisers said print, 60%; direct mail, 41%; digital, 36%; and broadcast, 36%.