---
id: "concept-terminal-value-collapse"
type: "concept"
source_timestamps: ["§ Corporate Math"]
tags: ["corporate-finance", "valuation", "equity-markets"]
related: ["concept-ai-fog", "claim-moat-vulnerability", "prereq-dcf-mechanics"]
speakers: ["Toby E. Stuart"]
definition: "The drastic reduction in a company's equity valuation that occurs when AI-driven uncertainty undermines the assumption of long-term business durability."
sources: ["futures"]
sourceVaultSlug: "hbr-seg-futures"
originDay: 2
articleStem: "hbr-foci-72-future-ai-fog"
sourceUrl: "https://hbr.org/2026/04/the-future-is-shrouded-in-an-ai-fog"
sourceTitle: "The Future Is Shrouded in an AI Fog"
---
# Terminal Value Collapse

In corporate finance, equity values are determined by projecting future free cash flows and adding a **terminal value** to capture long-horizon performance (prerequisite: [[prereq-dcf-mechanics]]). At current public-market multiples, terminal value often accounts for **60% to 80% of a company's total market capitalization.**

The sole justification for that terminal value is the assumption that the business is **durable**. The [[concept-ai-fog|AI fog]] directly threatens this assumption. If AI brings the long-term viability of a company's core product or service into question — by destroying software, process, or human-capital moats (see [[claim-moat-vulnerability]]) — investors must doubt the terminal value. And as [[quote-terminal-value]] states plainly, *once you doubt the terminal value, the valuation collapses; the company is simply worth less.* This fundamentally alters the cost of capital and the terms on which growth is financed, and it is the mechanism behind the [[concept-saaspocalypse]].

**Enrichment note:** The mechanism ('doubt durability → lower terminal value → lower valuation') is standard DCF logic and correct. For many growth companies terminal value does exceed 50% of modeled equity value, so the 60–80% range is plausible though assumption-dependent. Markets have re-rated tech/SaaS names, but attribution is complex (interest rates, macro slowdown, growth-narrative shifts) — the *AI-specific* causality and magnitude are asserted more strongly than current data supports.


## Related across articles
- [[claim-speculative-valuations]]
- [[claim-bubble-timing-distortion]]
- [[concept-saaspocalypse]]