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The Electric Motor Transition
The roughly thirty-year period between the introduction of electric motors to American factories (late 1880s) and the eventual productivity gains they produced (beginning around 1920) — the canonical historical precedent for understanding why transformative technologies disappoint before they deliver.
The electric motor transition is Brynjolfsson's most frequently invoked historical analogy — the cleanest validation of the J-curve framework and the sharpest illustration of why complementary investments determine whether a technology transforms an economy or merely decorates it. Factories adopted electric motors beginning in the late 1880s, initially installing them as direct replacements for the steam engines that powered central shafts running through factory floors. This was a bolting-new-technology-onto-old-layout approach that captured a fraction of the motor's potential. Real transformation required recognizing that electric motors enabled distributed power — individual motors at each workstation, eliminating the central shaft, allowing factories to be designed around production logic rather than power transmission constraints. This redesign took decades. The factories that undertook it achieved productivity gains so large they transformed American manufacturing. The factories that only bolted motors onto shafts experienced the early productivity paradox in its purest form.
