<b>Cost cap delivers 14% lower CPA than lowest-cost — at 30% less volume</b>

<b>Cost cap delivers 14% lower CPA than lowest-cost — at 30% less volume</b>
Across 24 accounts A/B'd on the same campaign, 60d.
— Lowest-cost bid: median CPA $41, full volume
— Cost cap (set at target): CPA $35, ~70% of volume
— Bid cap: CPA $33, ~45% of volume and choppy delivery
The cap buys efficiency by declining the expensive tail of the auction — so you scale slower.
Read: cost cap is a margin lever, not a growth lever. Use it when CPA discipline beats topline; switch to lowest-cost when you need volume.