The Amdahl's Law Blind Spot Distorting AI Impact Discourse: 1000x + 2x ≈ 4x, Not 500x
joshua_saxe · x · 2026-08-28
Security researcher Joshua Saxe points out a systematic math error in AI impact discussions: if AI speeds up 50% of a task's work by 1000x and the other 50% by only 2x, the whole task is accelerated just 4x, not the 500x people intuitively assume.
He calls this a System 1 bias that even serious policy people fall for, and argues it is distorting the broader discourse on AI's productivity impact — essentially Amdahl's Law applied to AI.
Related event: Amdahl's Law Shows AI Speedups Are Overestimated(2 posts)→
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