Campaign-budget vs ad-set-budget: the call that wastes the most money.

Campaign-budget vs ad-set-budget: the call that wastes the most money.
Campaign-level budget (CBO) is great for SCALING proven winners — it hunts the best set automatically.
Ad-set budget (ABO) is for TESTING — guarantees each idea gets fed equally so you get clean reads.
The mistake: testing on CBO. The algo dumps 80% into one set and you never learn if the others worked.
Test on ABO. Scale on CBO. Don't flip them.