Marginalism's Austrian Roots: Menger and the Subjective Turn

The Problem That Would Not Go Away

By the middle of the nineteenth century, political economy had produced a sophisticated body of work on trade, growth, and distribution. Ricardo had refined Smith’s insights into a model of rents, profits, and wages determined by the cost of production. John Stuart Mill had synthesized the classical tradition in his Principles of Political Economy (1848), a textbook so authoritative that many readers assumed the fundamentals were settled.

But one question refused to stay settled: what determines value?

Classical economists had converged on a cost-of-production theory. The “natural price” of a commodity, in the long run, reflected the labor and capital required to bring it to market. This framework worked tolerably well for manufactured goods produced under competitive conditions, but it stumbled over cases where costs seemed disconnected from the prices people actually paid. The diamond-water paradox, first articulated by Smith and sharpened by every subsequent generation, was the most famous embarrassment. Water sustains life; diamonds are ornamental. Yet a bucket of water cost virtually nothing in London, while a small diamond commanded a fortune. If value came from usefulness or from labor, something was wrong.

Various patches were tried. Some economists distinguished “value in use” from “value in exchange” and moved on. Others, following Ricardo, insisted that long-run cost was the anchor and demand merely determined short-run fluctuations. Marx pushed the labor theory of value to its logical extreme, arguing that only socially necessary labor time determined exchange ratios and that profit represented surplus extracted from workers. None of these solutions satisfied everyone. The puzzle was ripe for a genuinely new approach.

1871: Three Solutions at Once

The new approach arrived in a burst of near-simultaneous publication that historians call the marginal revolution. In 1871, Carl Menger in Vienna published Grundsätze der Volkswirtschaftslehre (Principles of Economics). In the same year, William Stanley Jevons in Manchester published The Theory of Political Economy. Three years later, in 1874, Léon Walras in Lausanne published Éléments d’économie politique pure. Each arrived, independently, at a strikingly similar insight: value is determined not by the total utility of a class of goods, but by the utility of the last, least important unit — the marginal unit — given the quantity already available.

The diamond-water paradox dissolved once you thought marginally. Water is abundant; the marginal glass adds little to a person already well supplied, so its price is low despite water’s enormous total importance. Diamonds are scarce; the marginal stone satisfies a desire that has not been met by previous stones, so its price is high despite diamonds’ modest contribution to survival. The key was to stop asking “how useful is water?” and start asking “how useful is the next unit of water to this person in these circumstances?”

This was a profound reorientation. Value was no longer a property embedded in objects by the labor or capital that produced them. Value was a relation between a person’s ends and the means available to satisfy those ends, evaluated at the margin. The subjective turn had arrived.

Menger: The Quiet Revolutionary

Carl Menger (1840-1921) was a Galician-born economist who spent most of his career at the University of Vienna. Unlike Jevons, who was a polymath with interests in logic and statistics, or Walras, who was driven by a vision of economics as a branch of applied mathematics, Menger was a careful, almost literary thinker who built his theory from the ground up, starting with the nature of goods and human needs.

In the Grundsätze, Menger laid out a classification that became foundational for the Austrian tradition. A thing becomes a good only when four conditions are met: a human need exists, the thing has properties that can satisfy that need, the person recognizes this causal connection, and the person can actually command the thing for that purpose. Goods become economic goods — as opposed to free goods like air in normal conditions — when the available quantity is insufficient to satisfy all the uses to which a person would like to put them. Scarcity forces economizing: the deliberate ranking of uses and the allocation of limited goods to the most important ones first.

From this foundation, the theory of marginal utility followed naturally. If a person has ten units of grain and uses them for purposes ranked from most to least important — sustaining life, maintaining health, feeding livestock, brewing beer, feeding pigeons — then the value of any single unit is determined by the least important use to which the total stock is applied. Lose one unit, and you sacrifice the pigeons, not your life. The marginal unit sets the value.

Menger’s presentation was verbal, tabular, and deliberately non-mathematical. He used a famous numerical table showing how the importance of successive units of different goods declines, but he did not write equations. This was not an accident or a limitation. It was a methodological choice that would define the Austrian school for generations.

Jevons and Walras: The Mathematical Path

Jevons’s contribution was to recast the same marginal insight in the language of calculus. He defined utility as a function of quantity and argued that rational exchange occurs when the ratio of marginal utilities equals the ratio of prices. His framework was explicitly mathematical, drawing on Benthamite utilitarianism and treating utility as something that could, at least in principle, be measured and compared.

Walras went further still. Where Jevons analyzed exchange between two parties, Walras constructed a model of general equilibrium — a system of simultaneous equations describing how all markets in an economy interact and clear simultaneously. In Walras’s vision, economics could aspire to the precision of celestial mechanics: a complete, self-contained mathematical system in which every price and every quantity was determined by the solution of a vast set of equations. The auctioneer (the tâtonnement process) groped toward equilibrium, adjusting prices until supply matched demand in every market at once.

The three discoverers shared the marginal insight, but their research programs diverged radically. Jevons and Walras set economics on a path toward formalization, optimization, and equilibrium models that would culminate in the Arrow-Debreu framework of the 1950s. Menger set the Austrian school on a different path — one that would emphasize process, subjectivism, and causal explanation over mathematical elegance.

What Made Menger Different

Several features of Menger’s approach separated him from his co-revolutionaries and planted the seeds of a distinct Austrian tradition.

Causal-realist methodology. Menger was interested in the causal mechanisms by which value arises and prices form. He wanted to explain how individuals’ subjective valuations lead, through exchange, to market prices — not merely to describe the mathematical conditions that hold when equilibrium exists. For Menger, the question was genetic: what is the origin of this phenomenon? Walras, by contrast, was interested in the logical structure of equilibrium itself: given these preferences and endowments, what prices are consistent with universal market clearing?

Orders of goods. Menger introduced a theory of higher-order goods — the idea that production goods (raw materials, tools, labor services) derive their value from the consumer goods they help produce, which in turn derive their value from the subjective evaluations of consumers. Value flows “backward” through the production structure, from first-order goods (bread) to higher-order goods (flour, ovens, wheat, plowshares). This imputation theory became the Austrian school’s distinctive approach to capital and production, emphasizing the temporal structure of production in ways that Walras’s simultaneous-equation framework did not.

Rejection of cardinal utility. Menger never claimed that utility could be measured in units or compared across persons. His numerical table illustrated ordinal ranking — this use is more important than that use — not cardinal measurement. Later Austrians, especially Ludwig von Mises, would radicalize this point, insisting that utility is strictly ordinal and that any attempt to add, subtract, or compare utilities across individuals is meaningless.

Institutions as emergent phenomena. In a remarkable chapter of the Grundsätze and in later work, Menger offered a theory of the origin of money as an unplanned social institution. Money, he argued, did not require a government decree or a social contract. It emerged spontaneously as traders discovered that certain commodities (salt, cattle, eventually precious metals) were more marketable — more readily accepted in exchange — than others. Traders who accepted these highly marketable goods, even when they did not want them for personal use, found they could trade them more easily for what they did want. Over time, the most marketable commodity became a universal medium of exchange: money. This account of institutional emergence through individual action, without collective design, became a template for Austrian explanations of social order more broadly.

The Methodenstreit: A War Over Method

The most consequential intellectual battle of Menger’s career was not with Jevons or Walras but with Gustav von Schmoller and the German Historical School. This controversy — the Methodenstreit, or “battle over methods” — erupted in the 1880s and shaped the identity of the Austrian school for decades.

The German Historical School held that economics should be an inductive, empirical discipline rooted in the careful study of particular nations, institutions, and historical periods. Universal “laws” of economics, in their view, were either trivially abstract or dangerously misleading when applied without regard to context. Schmoller’s program called for detailed historical monographs, statistical investigations, and policy analysis tailored to specific national conditions.

Menger’s Investigations into the Method of the Social Sciences (1883) was a direct challenge. He argued that economics needed exact laws — universal principles derived from the nature of human action and scarcity, not from historical induction. These laws were not empirical generalizations that might be overturned by the next data set; they were logical implications of the structure of purposeful human choice. History and statistics were valuable, Menger acknowledged, but they could not substitute for theoretical reasoning any more than a collection of astronomical observations could substitute for Newtonian mechanics.

Schmoller responded with a dismissive review. Menger replied with a polemical pamphlet. The debate grew heated and personal, with followers on both sides hardening their positions. The German Historical School dominated the German-speaking universities for a generation, which had the ironic effect of pushing Austrian economists into a tighter, more self-conscious school identity. Cut off from the German mainstream, the Austrians developed their own lineage: Menger to Eugen von Böhm-Bawerk and Friedrich von Wieser, then to Ludwig von Mises and Friedrich Hayek.

The Methodenstreit also shaped the Austrian school’s relationship with the Walrasian-neoclassical tradition that was developing in parallel. Both Menger and Walras were marginalists, but their methodological commitments were almost opposite. Walras wanted mathematics and general equilibrium; Menger wanted causal-genetic explanation and the logic of human action. The Austrian school would remain suspicious of formalization — not because its members could not do mathematics, but because they believed that mathematical models sacrificed the essential features of economic life: subjectivism, process, time, and uncertainty.

Böhm-Bawerk and the Capital Debate

Menger’s student Eugen von Böhm-Bawerk (1851-1914) extended the Austrian program in two directions that proved enormously influential. First, he developed the most systematic critique of Marx’s labor theory of value that the nineteenth century produced, arguing in Karl Marx and the Close of His System (1896) that Marx’s transformation of values into prices of production was logically inconsistent. Second, he built a theory of capital and interest based on the Austrian concept of higher-order goods and the time structure of production.

Böhm-Bawerk’s capital theory held that production takes time, that more “roundabout” (time-consuming) methods of production are generally more productive, and that the interest rate reflects the premium people place on present goods over future goods — a phenomenon he traced to three causes: the expectation of greater future wealth (which makes present goods relatively more valuable), the systematic underestimation of future needs, and the technical superiority of present goods as inputs to time-consuming production processes.

This framework was controversial from the start. Critics, including Irving Fisher and Frank Knight, challenged the notion that “roundaboutness” could be meaningfully measured or that it increased monotonically with the period of production. But Böhm-Bawerk’s work cemented the Austrian school’s commitment to treating capital as heterogeneous and temporally structured rather than as a homogeneous fund, a commitment that would prove central to the Austrian theory of the business cycle developed by Mises and Hayek in the twentieth century.

Why the Austrian Branch Diverged

By the early twentieth century, the marginal revolution had triumphed across the profession. Every major economics department taught some version of marginal analysis. But the revolution had split into two streams that were drifting apart.

The Walrasian-neoclassical stream, carried forward by Vilfredo Pareto, John Hicks, Paul Samuelson, and Kenneth Arrow, moved toward ever-greater mathematical formalization. General equilibrium theory became the prestige project of the profession. Optimization, equilibrium, and formal proofs became the language of serious economics. Subjectivism was retained in a thin sense — consumers maximize utility, firms maximize profit — but the rich Mengerian sense of subjectivism as the irreducible perspective of the acting individual, embedded in time and facing genuine uncertainty, was largely set aside.

The Austrian stream, carried forward by Mises and Hayek, moved in the opposite direction. Mises’s Human Action (1949) built an entire economic treatise on the foundation of praxeology — the logic of purposeful human action — without a single equation. Hayek’s work on knowledge, competition, and spontaneous order emphasized the limits of formal models and the importance of processes that could not be captured in simultaneous equations. The Austrian school became, in effect, the loyal opposition within marginalism: accepting the subjective-marginal framework but rejecting the mathematical-equilibrium apparatus that the mainstream had built on top of it.

This divergence was not inevitable. In an alternate history, Menger’s causal-realist approach might have been integrated with Walras’s formal methods, producing a richer synthesis. Some modern economists, particularly those working in agent-based modeling, evolutionary game theory, or complexity economics, are arguably attempting that synthesis today. But in the actual history, the split hardened, and the Austrian school found itself increasingly marginalized within the profession — celebrated by libertarian intellectuals and policy advocates, but often dismissed by academic economists as pre-scientific or ideological.

The Legacy: What Remains

The marginal revolution changed economics permanently. After Menger, Jevons, and Walras, no serious economist could treat value as a simple function of labor or production costs. The subjective, marginal framework became the foundation on which all subsequent microeconomics was built.

But the Austrian version of that revolution planted ideas that the mainstream absorbed incompletely, if at all. The emphasis on process over equilibrium — on how markets work, not just where they end up — resurfaces whenever economists study entrepreneurship, innovation, or institutional change. The insistence on heterogeneous capital becomes important whenever someone tries to understand why a recession destroys some firms and industries while leaving others intact. The theory of spontaneous order — institutions emerging from human action but not human design — appears in discussions of money, law, language, and norms that range far beyond economics.

Menger himself might be surprised by how his quiet, careful book launched a tradition that is at once one of the most intellectually distinctive and most contentious in the history of economics. He did not seek to found a school. He sought to understand why things have value. The answer he gave — that value lives in the relation between a person’s needs and the next available unit of a scarce good — was simple enough to state in a sentence. Working out its implications has taken a century and a half, and the work is not finished.

The subjective turn began in 1871. Its Austrian branch, rooted in Menger’s insistence on causal explanation, institutional emergence, and the irreducible perspective of the choosing individual, remains a living challenge to any economics that mistakes its models for the world they are meant to illuminate.