CBO auto-distributes budget across ad sets. Wait 3-7 days before judging. Use spend limits for control.
By The Ad Spend
Meta feature setting budget at campaign level with automatic distribution across ad sets based on performance. Now called Advantage Campaign Budget.
Formula
Campaign-level budget with auto-distribution
Benchmark range
Let campaigns run 3-7 days before judging distribution. Algorithm needs time to find winners.
Why it matters
CBO works best when ad sets have similar audience sizes and goals. If one ad set has much larger audience, CBO may over-allocate. Use ad set spend limits when you need control. Don't judge CBO performance in first 3 days.
