PERSON
William Stanley Jevons
The Victorian economist who built the most uncomfortable argument in the history of efficiency—that making a resource cheaper to use causes total consumption to rise, not fall—and whose paired insights about rebound effects and diminishing marginal utility are now the most precise analytical tools available for understanding what AI is doing to human cognitive labor.
William Stanley Jevons published The Coal Question in 1865 and demonstrated, with the meticulous data-gathering that characterized his scientific method, that improvements in steam-engine efficiency had not conserved Britain’s coal. They had caused coal consumption to explode. Between 1830 and 1863, annual coal consumption rose from approximately thirty million tons to over eighty-six million. Watt’s improved engine had made coal useful for applications that were previously too expensive to pursue, and the expansion of demand overwhelmed the per-unit savings. It is wholly a confusion of ideas, Jevons wrote, to suppose that the economical use of fuel is equivalent to a diminished consumption. The very contrary is the truth. Six years later his Theory of Political Economy gave economics the concept of marginal utility—the insight that value is determined not by total usefulness but by the satisfaction provided by the last
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