Reject valuations that rest on TAM rather than revenue

Claim

The second filter to apply after [[principle-down-a-lot-is-not-cheap]], and the one that clears most of what survives the first in emerging-technology and small-cap screens.

TAM is an argument about a market. Revenue is a fact about a company. A pitch that substitutes the former for the latter has usually done so because the latter doesn't support the price. This is not a bias against early-stage businesses — it's a refusal to apply a multiple to a business that doesn't yet have the thing being multiplied.

Test

Ask, in order: 1. Is there revenue? Not bookings, not backlog, not LOIs — recognised revenue. 2. Is it growing, and from a base large enough that the growth rate means something? 3. Does the valuation make sense against that number, or only against the TAM slide?

If the case only works at step 3, it's a story. It may still be worth owning — but as a speculative position sized accordingly, per §6 of analysis_notes.md, not as a value holding.

Why it recurs

TAM framing dominates exactly where verification is hardest: pre-revenue technology, defense small-caps, quantum, eVTOL, space. Those are also the sectors where promotional material is most abundant and independent coverage thinnest.

What would falsify this

A systematic finding that TAM-based valuations in a given sector predicted returns better than revenue-based ones. Worth genuinely testing rather than assuming — the principle is a prior, not a law.

Related

[[principle-down-a-lot-is-not-cheap]] · [[principle-crypto-beta-is-not-diversification]]

History

• 2026-07-29 — formalised across the July sweep rounds after recurring in the June small-cap defense and quantum screens.