Table Table 3 Go-to-market & pricing 2 September 2026

Which operational miscalculations undermine market sizing?

Miscalculation	Root cause	Strategic failure	Corrective protocol
The 1% market share fallacy	Projecting revenue by taking an arbitrary sliver of a huge TAM	Produces ungrounded forecasts decoupled from sales capacity	Build bottom-up models bounded by sales rep quotas
Conflating TAM with SAM	Treating all industry participants as qualified prospects	Hires sales reps in regions where the product lacks fit	Segment SAM by technical compatibility and geography
Ignoring incumbent switching costs	Assuming satisfied prospects will readily abandon incumbents	Severely overestimates pipeline conversion velocity	Discount SAM by contractual lock-in and replacement friction
Static market sizing	Treating TAM as a fixed number rather than an evolving space	Misses regulatory shifts and technological obsolescence	Update market sizing models annually based on win-loss data
Omitting customer willingness to pay	Assuming all accounts will pay premium enterprise prices	Misprices offerings across low-tier and enterprise segments	Parameterize ACV tiers across discrete account bands

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Reference & Evidence

Source: Table from this essay. Sources and interpretation are given in the article.

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What are TAM, SAM, and SOM?

TAM, SAM, and SOM establish a nested market sizing architecture that separates aggregate theoretical demand from operational go-to-market capacity.

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Isoglu, S. (2026). Which operational miscalculations undermine market sizing? [Table]. isoglu.com. https://isoglu.com/insights/exhibits/isoglu-2026-what-are-tam-sam-som-fig03/

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@misc{isoglu-2026-what-are-tam-sam-som-fig03,
  author = {Isoglu, Sinan},
  title = {{Which operational miscalculations undermine market sizing?}},
  year = {2026},
  howpublished = {Table 3, isoglu.com},
  url = {https://isoglu.com/insights/exhibits/isoglu-2026-what-are-tam-sam-som-fig03/},
  note = {From the essay {What are TAM, SAM, and SOM?}}
}

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