# Incrementality
> The revenue that only happened because of the ad.
- Canonical: https://xeli.ad/knowledge/incrementality
- Type: entity
- Entities: Incrementality, Creative Testing, ROAS, CPA, Attribution
- Topic coverage: 35% · AI citation readiness: 60%
## Definition
Incrementality is the causal lift produced by advertising, measured with holdouts, geo splits or platform lift studies rather than inferred from attributed conversions.

## Why it matters
It is the only honest arbiter when platform ROAS and blended ROAS disagree.

## Keyword cluster
- incrementality testing
- geo lift test
- conversion lift study
## Related
- [Creative Testing Framework](https://xeli.ad/guides/creative-testing-framework): A statistically-sound, budget-realistic framework for testing paid social creative — how many variants, how much spend, how long, and how to read the results.
- [Attribution](https://xeli.ad/knowledge/attribution): The rules deciding which ad gets credit for a sale.
- [CPA](https://xeli.ad/knowledge/cpa): What one conversion costs you, all-in.
- [Ad Recall](https://xeli.ad/glossary/ad-recall): The share of exposed users who remember seeing an ad within a defined window.
- [Click Attribution](https://xeli.ad/glossary/click-attribution): Attribution that only credits ads the user actually clicked before converting.
- [Contribution Margin](https://xeli.ad/glossary/contribution-margin): Revenue remaining per order after all variable costs.
- [Meta Ads Creative Strategy](https://xeli.ad/guides/meta-ads-creative-strategy): A modern, opinionated playbook for building Meta ad creative that scales — hooks, formats, iteration cadence, and the metrics that actually matter.
- [Ecommerce Scaling Playbook](https://xeli.ad/guides/ecommerce-scaling-playbook): How the metrics, campaign structure, and creative pipeline change at each stage of scaling a DTC brand from $10k to $1M/mo in paid media.
## Entity graph
- [Incrementality](https://xeli.ad/knowledge/incrementality): The revenue that only happened because of the ad.
- [Creative Testing](https://xeli.ad/knowledge/creative-testing): A disciplined loop for finding which angles deserve budget.
- [ROAS](https://xeli.ad/knowledge/roas): Revenue divided by ad spend — the headline efficiency number.
- [CPA](https://xeli.ad/knowledge/cpa): What one conversion costs you, all-in.
- [Attribution](https://xeli.ad/knowledge/attribution): The rules deciding which ad gets credit for a sale.
---
Source: Xeli AI — the Agentic Creative OS for ecommerce. https://xeli.ad