The bid should always sit above your target CPC — here's why.
Counter-intuitive but correct: your bid should sit above your target CPC, never at it. This final episode of Module 2 explains why, and how to set the headroom without overspending.
We close Module 2 on the most counter-intuitive rule in Amazon PPC: your bid should always sit above your target CPC, not at it. The instinct of every new advertiser is to bid exactly what they want to pay. That instinct is wrong, and the wrongness compounds fast.
Why "bid = target CPC" under-delivers
Three reasons in increasing order of importance:
- The auction is second-price. You pay (roughly) one cent above the next-highest bid, not your full bid. Bidding €0.55 when your target CPC is €0.55 means you only enter auctions where the next bidder is at €0.54 or below. Your effective ceiling is the next bidder's bid, not yours.
- Dynamic bidding cuts your bid in cold auctions. With "Down only" or "Up and down," Amazon lowers your bid on auctions it judges low-converting. If your starting bid is your ceiling, you have no slack for Amazon to use.
- Placement modifiers multiply on top.Top-of-search placements need bid headroom to clear at the +modifier. Bidding at your target CPC kills your top-of-search visibility.
How much headroom?
A working rule:
- Down-only campaigns: bid = target CPC × 1.4.Amazon can reduce by up to 100 % on low-converting auctions; the headroom keeps you in the higher-converting ones.
- Up-and-down campaigns: bid = target CPC × 1.6–1.8.Same reasoning, plus headroom for upward adjustments on high-converting auctions.
- Fixed-bid campaigns: bid = target CPC × 1.0.The only case where bid equals target, because Amazon will not adjust either way.
Why this doesn't blow up your spend
The headroom buys you access to better auctions; it does not raise your average CPC much because the second-price rule still caps what you actually pay. Empirically, moving from bid = target CPC to bid = 1.4 × target CPC raises aCPC by 5–10 % and lifts impression share by 20–30 %. The ROAS impact is positive on almost every campaign we test.
Closing the module
You now have the PPC fundamentals: account setup, eligibility, the bid range, keyword research, budgeting and dynamic bidding, the bid-vs-CPC-vs-aCPC trio, the four goal categories, brand defence and conquesting, second-order effects, visibility, reading and calculating from the data, and the bid-headroom rule that ties them together.
Module 3 picks up from here with hands-on campaign builds: account structure, naming conventions, launching auto and manual campaigns, search-term harvesting, negative-keyword cycles, dayparting, and scaling profitable winners. Every episode in Module 3 leans on the foundations we just built.
Watch Episode 24: Warum das Gebot immer höher sein sollte als der Klickpreis (German)
The German walkthrough — why bid should exceed target CPC, and by how much.
Module 2 done. Module 3 next.
You now have the PPC fundamentals. Module 3 covers hands-on setup, naming conventions, harvesting and scaling. Run your account with AMALYZE while you wait.