Measure Supplier-Funded Promotion Incrementality
Separate the effect of an offer from paid visibility. Plan holdouts, calculate incremental orders and reconcile supplier funding, fees and contribution.
How to measure supplier-funded promotion incrementality
A funded offer can generate redemptions without generating additional demand. A sponsored placement can move sales between products without improving the category. Design the measurement before launch so you can distinguish these effects, reconcile the money and decide whether the combined promotion deserves another investment.
Start with the decision the test must support
Decide whether you are testing the saving, the paid visibility or their combination. Choose the outcome that informs the next budget decision: additional category contribution, incremental product sales, new-to-brand purchasing or another precisely defined measure. Report attributed sales separately; attribution identifies an observed path, while incrementality asks what would have happened without the treatment.
Particular Audience's Trade Media description distinguishes sponsored visibility from funded savings. Carry that distinction into the experiment and finance ledger instead of treating the promotion as one undifferentiated spend line.
Separate the offer from its visibility
Where operations and traffic allow, allocate eligible shoppers consistently to four conditions: usual experience, offer without additional sponsored exposure, sponsored exposure without the offer, and both. Keep eligibility, assortment and observation windows comparable. A shopper should not drift between conditions because they refresh a page or return later.
Agree what happens when products sell out, a supplier changes an offer, or another campaign reaches the same audience. Record those events. If assignment must happen by store or another group, analyse at the appropriate assignment level. When a four-condition design is impractical, narrow the question and state which effects the simpler test cannot separate.
Read the contrast, not just the headline
Consider a synthetic example with 10,000 eligible visits per condition. The usual experience records 200 orders; offer-only records 230; media-only records 220; both records 270. The corresponding order rates are 2.0%, 2.3%, 2.2% and 2.7%.
The combined condition is 0.7 percentage points above control, equivalent to 70 additional orders per 10,000 eligible visits in this example. Its 270 orders are not all incremental. The interaction contrast is 2.7% − 2.3% − 2.2% + 2.0% = 0.2 percentage points. That calculation describes the observed pattern; it does not establish statistical certainty. Set sample requirements and an analysis plan before launch, then report uncertainty alongside the estimate.
Reconcile shopper value and commercial value
Maintain separate entries for product revenue, product cost, retailer-funded discount, supplier reimbursement, media charges and redemption-related fees. The supplied worksheet is a retailer contribution ledger, with perspective fixed to retailer. Supplier and combined-business analyses require separately reconciled ledgers. State whose perspective each total represents. A supplier's funding expense and the retailer's reimbursement are two sides of a transfer, not two new sources of combined value.
Inspect category substitution, returns, cancellations and repeat purchasing within the agreed window. If promoted products gain sales while equally profitable alternatives lose them, a product-only report can overstate the opportunity. Establish the baseline accounting treatment so a discount is not subtracted twice from net revenue.
Turn the result into a decision
Publish the eligibility rule, assignment method, exposure checks, outcome definitions and exclusions with the result. Explain whether the next action is expand, revise or stop, and what evidence would change that decision. Use the measurement overview to scope instrumentation and holdout requirements before committing the promotion budget.
Illustrative example
{"label":"Synthetic equal-size four-condition example","eligible_visits_per_arm":10000,"orders":{"control":200,"offer":230,"media":220,"both":270},"rates":{"control":0.02,"offer":0.023,"media":0.022,"both":0.027},"both_minus_control_percentage_points":0.7,"additional_orders_at_equal_exposure":70,"interaction_percentage_points":0.2,"inference":"No uncertainty estimate or causal conclusion can be inferred merely from this illustrative table."}
Downloads
- pa-promotion-test-design.csv (illustrative template)
- pa-promotion-arm-results.csv (illustrative template)
- pa-promotion-ledger.csv (illustrative template)
Sources
- Trade Media & Supplier-Funded Savings, checked 2026-10-25
- Measurement & Incrementality, checked 2026-10-25
How Particular Audience does it
Frequently asked questions
Is promotion redemption a measure of incrementality?
Redemption shows that an eligible saving was used. It does not reveal whether the shopper would otherwise have purchased the same item, another item or nothing. Estimate incrementality from a credible comparison and retain redemption as an operational and funding-reconciliation measure.
What if we cannot run all four test conditions?
Choose a simpler comparison that answers the most important decision and state its limit. A combined offer-and-media test can evaluate the package, but cannot identify each component’s separate effect. Keep assignment stable and have an analyst review sample size and likely contamination.
Should supplier funding be counted as retailer profit?
Reconcile it according to the agreed accounting treatment and reporting perspective. Funding may reimburse a shopper saving; it is not automatically additional profit. Include relevant product costs, retained discount costs, fees, returns and any category substitution before interpreting the retailer’s contribution change.