Work backwards from contribution margin
Calculate the contribution margin for every ASIN after landed cost, referral fees, fulfilment, returns and storage. Only then can you set a break-even ACOS per product rather than a single account-wide target that quietly subsidises weak items.
High margin products can absorb aggressive bidding for market share. Thin margin products should be defended, not scaled.
Structure campaigns around intent
Group keywords by buying intent rather than by product family alone. Branded defence, high intent generic, competitor conquest and discovery each deserve their own budgets and their own success criteria.
Mixing these into one campaign guarantees that discovery spend hides behind branded efficiency, and the reported ACOS becomes meaningless.
Measure with TACOS and incrementality
Total advertising cost of sales connects paid spend to total revenue and reveals whether paid activity is lifting organic rank or simply harvesting demand you already had.
Periodic hold-out tests on selected ASINs, run long enough to clear the ranking lag, give an honest read on incremental value.
Key takeaways
- •Set break-even ACOS per ASIN, not per account.
- •Separate branded, generic, conquest and discovery budgets.
- •Use TACOS and hold-out tests to check incrementality.
Want this reviewed against your own account? Request a growth assessment.