Practical promotion economics

Buy two, get one free at the contribution threshold

Convert 450 identical-item bundles into 1,350 delivered units at the correct realized average price.

Entirely synthetic case. The expected baseline and commercial inputs are deliberately supplied assumptions.

The decision

Are bundle counts hiding the inventory and margin burden?

Product–campaign rows1
Contribution change€0
Gross unit lift125.0%

Source inputs

Campaign / productExpected baseline unitsPromotion unitsRegular / promotion priceVariable unit cost
Example identical refill
Synthetic buy two get one
6001,350€30 / €20€12

What to inspect

Open a row’s full contribution bridge, check the day-window alignment and cost allocation, then vary the expected baseline and response in Scenario studio. The portfolio result includes the recorded refunds, supplier support and displacement; unrecorded effects remain excluded.

Read the accompanying decision guide

Interpretation limits

The figures are generated from the same deterministic engine used by the workbench. They are not evidence from a merchant or a randomized test. A supplied baseline can make an offer look attractive or unattractive, so the baseline deserves the same scrutiny as the campaign’s realized sales.

How to read this case

450 bundles deliver 1,350 units. At €20 average revenue and €12 cost per delivered unit, contribution matches 600 full-price units at €30.

Case-specific assumptions

  • The row is identical-item unit accounting, not a forecast of 450 new customer orders.
  • Realized average unit price is €60 bundle revenue divided by three delivered units.

Download the portable project JSON ↓