Daily budget
The most a campaign can spend in a day. When it caps, your ads stop showing.
A campaign that hits its cap stops serving for the rest of the day — usually during the evening hours when conversion is strong.
A campaign capping out while under its ACOS target is the clearest signal in advertising: it is profitable and you are switching it off daily. That is a budget problem, not a bid problem, and raising bids makes it worse.
AutoPPC watches for exactly this pattern and proposes a budget raise, gated on efficiency, verified stock cover, and your account daily cap.