Incrementality

Incrementality is the sales marketing actually caused, the audit on conversions platforms merely witnessed.

What incrementality is

Incrementality is the sales that wouldn’t have happened without the marketing: the lift caused by a campaign, isolated from the orders that were coming anyway, measured by comparing exposed against withheld.

Why incrementality matters

Platforms claim credit for conversions they merely witnessed: the retargeting ad shown to someone already returning, the brand search ad clicked by someone typing your name. Incrementality is the audit, and it routinely reveals that some heavily credited spend adds little, while undervalued channels quietly do the causing.

How incrementality gets measured

Geo tests: matched regions with spend on versus off
Holdout groups: audiences deliberately unexposed as the control
Platform lift studies: built-in conversion-lift experiments
Go-dark tests: pausing a channel and watching what actually drops

Frequently asked questions

Which spend should be tested first?

The biggest and the most suspicious: top budget lines, retargeting, and brand search, the places where platform-claimed credit and caused lift diverge most. One honest geo test on a major line often repays the whole measurement effort.

What does an incrementality result change?

The budget: channels proven incremental earn scale, witnesses get cut or capped, and blended targets get rebuilt on caused revenue. The test that doesn’t move money was theater.

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