The History of Opportunity Cost: How Economists Learned to Count What You Give Up
1776: Smith's Deer and Beaver
Adam Smith's Wealth of Nations (1776) contains an early version of the idea in his famous example of a primitive hunting society: if it usually costs twice the labor to kill a beaver as to kill a deer, one beaver should naturally exchange for two deer. The reasoning is implicitly an opportunity-cost argument — the real cost of a beaver is the deer the hunter could have taken with the same effort. Smith framed this in terms of labor expended rather than forgone alternatives, and classical economics after him would continue to locate cost in inputs used up rather than in options surrendered. But the seed of the modern idea is visible.
1850: Bastiat and the Unseen
The French writer Frédéric Bastiat published What Is Seen and What Is Not Seen in 1850, containing the parable of the broken window. A shopkeeper's window is smashed; onlookers console themselves that at least the glazier gets work. Bastiat's point is that the six francs spent on glass would otherwise have bought shoes or a book — the visible repair conceals an invisible alternative that was destroyed along with the window. This is opportunity cost as a rhetorical and analytical discipline: always ask what the resources would otherwise have done. It remains one of the most widely cited illustrations of the concept in introductory teaching.
The 1880s-1890s: Wieser and the Austrian School
The Austrian economist Friedrich von Wieser, a student of the marginalist tradition founded by Carl Menger, developed the systematic idea that the cost of using a resource is the value of the best alternative use it is withdrawn from — an argument he set out in works including Der natürliche Werth (1889). This inverted the classical view: cost is not something that determines value from below but is itself a forgone value. Wieser is generally credited with originating the concept that English speakers came to call opportunity cost; the English phrase itself entered the literature in the 1890s, with an 1894 article by the American economist David I. Green frequently cited as an early prominent use.
1932: Robbins Makes It the Definition of Economics
Lionel Robbins's An Essay on the Nature and Significance of Economic Science (1932) defined economics as the science that studies human behavior as a relationship between ends and scarce means which have alternative uses. That definition placed opportunity cost at the very center of the discipline rather than treating it as one tool among many: if means are scarce and have alternative uses, then every choice necessarily forecloses something else, and the economist's job is to analyze that trade-off. Robbins's formulation is why introductory textbooks still open with scarcity, choice, and trade-offs before any curve is drawn.
1969: Buchanan and Subjective Cost
James M. Buchanan's Cost and Choice: An Inquiry in Economic Theory (1969) pressed the concept further, drawing on a tradition associated with the London School of Economics. Buchanan argued that opportunity cost is inherently subjective and tied to the moment of choice: it is the value the decision-maker places on the alternative not taken, which by definition is never realized and therefore never observed or measured by anyone else. This sharpened the distinction between accounting costs, which appear in ledgers, and economic costs, which include forgone alternatives. Buchanan received the Nobel Memorial Prize in Economic Sciences in 1986.