A practical workflow
Follow the guide step by step
- 01
Record the observed listing price
Start from the visible listing price and review the captured Buy Box or offer context. Keep that observation separate from any hypothetical price used in a stress test.
- 02
Test lower selling prices
Compare the base audit with the built-in 5%, 10%, and 15% listing-price reductions. The scenario changes the selling price while holding the other audit assumptions constant.
- 03
Enter a competition buffer deliberately
Use the seller-entered competition buffer to model a possible undercut. The observed Buy Box price is not silently reduced, and visible seller counts do not predict a specific future price.
- 04
Compare supplier costs and target ROI
Enter a second supplier cost for a side-by-side profit and verdict comparison, or set a desired ROI to estimate the highest supplier price the current assumptions can support.
- 05
Model advertising separately
When available on the Seller plan, compare the four ACOS or TACOS planning levels. Review the estimated profit, margin, and ROI at each level before applying a scenario to the audit.
Know what each scenario changes
The downside price matrix changes listing price only; costs, fulfillment assumptions, advertising, fees, returns, and the entered discount stay fixed. The competition buffer is a separate seller-entered stress test, not a prediction based on the visible offer count.
ACOS and TACOS scenarios are also planning estimates. In this single-unit model ACOS uses listed revenue, while TACOS uses post-discount sales revenue. Marketplace costs should still use verified, current assumptions.
Use scenarios to find fragile assumptions
If a modest price change flips a result from Buy to Review or Avoid, the opportunity depends on a narrow margin of safety. Compare that sensitivity with supplier terms, order size, months of inventory cover, and the cash required.
These scenarios do not import future prices, ad reports, or sales forecasts. They show how the numbers change when you supply a different assumption.
Why stress tests matter
Prices fall when competitors join or promotions end, so a purchase that only works at today's price is fragile.
Use the weakest scenario that still passes as your safety margin when you decide the order quantity.
Build a scenario matrix without changing observed facts
Keep the current listing price and captured offer details as observations. The built-in 5%, 10%, and 15% downside views change listing price only; they hold the other audit inputs constant so you can isolate price sensitivity.
To explore a different supplier quote, ad cost, return allowance, or inventory hold period, change that assumption deliberately and recalculate separately. If a small plausible change flips the verdict, treat the opportunity as fragile under those assumptions rather than as a forecast of what the market will do.
- Label each input as observed, seller-entered, or hypothetical.
- Change one assumption at a time when you want to understand what drives a result.
- Record which scenario crosses your threshold and what evidence could reduce that uncertainty.
Common questions
Frequently asked questions
Does the competition buffer change the saved listing price?
No. It is a separate seller-entered stress test. The visible Buy Box price remains the recorded observation.
What changes in the 5%, 10%, and 15% price-drop scenarios?
Only the listing price changes. The other audit inputs stay the same so you can see the effect of a lower selling price.
Does an ACOS or TACOS scenario use my live advertising account?
No. It models seller-entered planning levels and does not connect to an advertising account or retrieve campaign reports.
How much should I lower the price in a stress test?
Many sellers test 5, 10, and 15 percent drops. Choose based on how volatile the category is.
Ready to check a listing?
Put the assumptions to work.
Bring the visible listing facts and your own costs into a product audit before you commit to inventory.