Table 316 Aug 2026From “The incrementality illusion”

The four-tier commercial measurement governance framework

A structural allocation protocol matching measurement rigor to channel scale and statistical viability.

Table 3The four-tier commercial measurement governance framework

Tier & Scale	Applicable Channels	Mandated Measurement Methodology
Tier 1: High scale	Display, social or paid search where volume and geography support testing	Randomized geo-holdouts and ghost ads: Measure incremental cost per acquisition; do not let platform attribution govern alone.
Tier 2: Macro mix	Brand, CTV, podcast and other aggregated awareness channels	Calibrated Bayesian media mix modeling: Use time-series models anchored by periodic experimental evidence where feasible.
Tier 3: Low volume	B2B pipeline, account-based marketing, niche campaigns or long-cycle outcomes	Unit-economic payback bands: Govern contribution margin and payback, and use causal designs when their precision and cost are acceptable.
Tier 4: Defensive	Branded search and bottom-funnel retargeting	Measured defensive restrictions: Use exclusions, bid tests and frequency or recency caps set as experiment parameters.

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Source: Author's synthesis of the cited econometric literature.

PNG4:3, 1600 × 1200, with the title, the source line and the attribution set in the image isoglu-2026-the-incrementality-illusion-fig04.png

From the essay

Growth that compounds

The incrementality illusion

Why attribution dashboards can report phantom returns while holdout tests find little or no lift, and how to size causal measurement.

16 Aug 2026

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Isoglu, S. (2026). The four-tier commercial measurement governance framework [Table]. isoglu.com. https://isoglu.com/insights/exhibits/isoglu-2026-the-incrementality-illusion-fig04/

BibTeX

@misc{isoglu-2026-the-incrementality-illusion-fig04,
  author = {Isoglu, Sinan},
  title = {{The four-tier commercial measurement governance framework}},
  year = {2026},
  howpublished = {Table 3, isoglu.com},
  url = {https://isoglu.com/insights/exhibits/isoglu-2026-the-incrementality-illusion-fig04/},
  note = {From the essay {The incrementality illusion}}
}

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  <figcaption>Table 3: The four-tier commercial measurement governance framework. Source: Author&#39;s synthesis of the cited econometric literature. <a href="https://isoglu.com/insights/exhibits/isoglu-2026-the-incrementality-illusion-fig04/">View exhibit</a>.</figcaption>
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