Devendra Sahal

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