The Marginal Revolution
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What Is The Marginal Revolution?
The Marginal Revolution was the transformation of economic theory in the 1870s, when Carl Menger, William Stanley Jevons, and Leon Walras independently arrived at the same insight: that the value of a good is set at the margin by the utility of the last unit consumed, not by the labor embodied in it. This idea of marginal utility displaced the classical and Marxian labor theory of value at the center of price theory. By focusing on the choices of individuals at the margin, the revolution recast economics around subjective valuation and optimization, laying the groundwork for the neoclassical economics that would dominate the twentieth century.
Why It Matters
The Marginal Revolution matters because it reoriented economics around the decisions of individuals weighing one more unit of something against its cost, the framework students still learn today. By locating value in subjective usefulness rather than in labor, it undercut the labor theory of value and offered a unified way to analyze consumers, firms, and prices. Menger's contribution in Vienna also launched the Austrian School, while the broader marginalist approach fed into the neoclassical synthesis. The revolution's emphasis on marginal thinking underlies core tools such as marginal cost, marginal benefit, and diminishing marginal utility that anchor modern microeconomics.