---
type: "synthesis"
sources: ["commercial"]
tags: ["tam-expansion", "demand-curve", "synthesis"]
id: "xd-serving-previously-uneconomical-segments"
sourceVaultSlug: "hbr-seg-commercial"
originDay: 5
articleStem: "hbr-seg-commercial"
sourceUrl: "(unified vault: 9 sources)"
sourceTitle: "HBR — Demand Ⅰ-C · Commercial mechanics — pricing, fit, sales"
---
A constructive counter-melody to the 'ruthless focus' theme: three articles show how to *widen* who you can profitably serve — by changing the cost or the model, not just picking the top of the curve.

- **A064:** AI drops [[prereq-cac-and-ltv|CAC]] enough to make the 30–40M SME segment profitable — [[concept-ai-driven-tam-expansion|TAM expansion]] by re-engineering unit economics, not by adding salespeople.
- **A022:** discounting to [[concept-variable-cost-pricing-floor|variable cost]] via [[concept-discounting-hurdles|hurdles]] lets a firm serve the *bottom* of the [[prereq-downward-sloping-demand|demand curve]] — buyers who'd otherwise never purchase — as pure [[claim-incremental-profit-variable-cost|incremental profit]].
- **A009:** a [[concept-business-model-portfolio|business model portfolio]] captures buyers whose desired *access/usage/pricing* the single model excluded ([[claim-single-model-is-ceiling]]).

The productive tension with [[xd-quality-of-revenue-thesis]]: A003/A008 say *narrow and fire*; A064/A022/A009 say *widen and serve*. The reconciliation is that all four narrow along the axis of *fit/economics* while widening along the axis of *addressable price points and use cases*. Expanding TAM by lowering cost-to-serve is virtuous; expanding revenue by taking on poor-fit customers at full cost-to-serve is [[concept-sales-debt|sales debt]]. The discriminating question is always cost-to-serve versus value captured.