---
title: "Devendra Sahal"
type: "entity"
entity_kind: "person"
status: "hub"
canonical_name: "Devendra Sahal"
aliases: []
first_seen: "2026-07-15T00:00:00.000Z"
writer_model: "claude-sonnet-5"
connects_to: ["Sahal's identity","Wright's law","Moore's law","technological forecasting","learning curves"]
---


Technology-forecasting economist credited by Lafond, Bailey, Bakker, Rebois,
Zadourian, McSharry & Farmer (2017) with first proving, in 1979, the identity
that Wright's Law (cost falls per cumulative-production doubling) and Moore's
Law (cost falls per unit calendar time) collapse into the same curve whenever
cumulative production grows exponentially. The vault uses that identity as a
diagnostic — not just a convenience — for whether a given technology's moat
belongs on the production-volume axis or the calendar-time axis, most sharply
in the EUV-mirror case, where the identity's own precondition fails. The
vault knows him only secondhand so far, through Lafond et al.'s citation; his
own 1979 paper is unread.

## References
- [[claim-sahals-identity-equates-wrights-law-and-moores-law]]
- [[claim-asml-euv-shipment-history-fails-sahals-exponential-precondition]]
- [[claim-euv-mirror-advantage-is-tacit-know-how-not-patent]]
- Captures: 2026-07-15-dup-risk-aluminium-lowbackgroundsteel-bridge (indirect), 2026-07-16-hop-euv-sahal-boundary