Imagine you have a certain ad set with a daily budget of $200 and you have one or more different ads within that ad set. While it is possible that each of the ads within the ad set has spent the same amount of money, it is rare. Unless you specify otherwise, Ad networks tend to automatically spend more money on the most relevant ads, and less money on the least relevant ads.
Ad Set Budget = $200
Ad 1 = $100 Ad 2 = $50 Ad 3 = $25 Ad 4 = $20 Ad 5 = $5
