Campaign budget optimization (CBO) is one of the finest advertising options; where the optimization takes place at campaign level instead of ad set. Advertisers who are looking to run multiple ad sets or searching for the winning ad set can get maximum benefit from CBO. Advertisers will not be able to change bids or budget from audience level. Instead, campaigns in real time will optimize automatically towards the best performing & lowest cost audience based on what Facebook considers most scalable and efficient.
Let’s discuss with the above example to better understand CBO. Assume you have a daily/lifetime budget of $150 & you want to run a campaign for three different audiences(ad sets). The maximum budget will be delivered for best performing ad set in order to get maximum value in minimum cost. In this example, the total conversions achieved form this campaign are 22. Majority of the budget was spent on Ad set 3 due to high conversion at minimum possible cost.