Neoclassical School of Economics
This article is part of the Basic Liberalism Course -> Module 4: Main Schools of Economics
Last updated: 2026-05-17
NOTE : To correctly understand this article, it is recommended to read first:
The Neoclassical School of Economics emerged around the 1870s in what is known as the Marginalist Revolution. This current completely transformed economic science by displacing the theories of the classical economists (such as Adam Smith and David Ricardo) and introducing a strongly mathematical approach centered on individual behavior.
While the classics focused on social classes, capital accumulation, and long-term production costs, the neoclassicals focused on consumer choice, scarcity, and the optimal allocation of resources.
Main Points and Concepts
Marginalism and Subjective Value:
It is the core of the school. The value of a good is not determined by the hours of labor required to produce it (refuting the classical-Marxist theory), but by the subjective utility that the consumer assigns to the last unit consumed (marginal utility) in relation to its scarcity.
The Homo Economicus (Rationality):
It assumes that economic agents are perfectly rational and seek to maximize their own well-being in a selfish way: consumers seek to maximize their utility and companies seek to maximize their profits, all under budget or resource constraints.
Market Equilibrium:
Prices are determined at the exact point where supply equals demand. They introduced both the concept of partial equilibrium (analyzing an isolated market) and general equilibrium (interconnection of all markets in the economy).
In neoclassical models (especially Walras, Arrow, and Debreu's general equilibrium models), very strong assumptions are made:
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All relevant information is available and known by all agents (or at least by a “planner” who could calculate it).
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Consumers' preferences are given and stable.
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Technology and resources are given.
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Perfect competition exists (no one has market power).
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Time does not pass in a relevant way (it is a static model or of instantaneous equilibrium).
Under these assumptions, the price system can, in theory, lead to a situation of general equilibrium where resources are allocated in a Pareto-optimal way: no one can improve their situation without worsening that of another. That is, an “optimal” allocation is reached in the static sense: everything is perfectly coordinated, there is no waste, there are no unexploited profit opportunities, and prices exactly reflect social opportunity costs.
That is the ideal that many neoclassical economists have in mind when they talk about “market efficiency”.
In that static world (frozen in time), the price mechanism reaches a point of perfect mathematical equilibrium where supply equals demand instantly. Resources are “optimally allocated” because the mathematical snapshot closes perfectly.
Mathematization of Economics:
They turned economics into a formalized science through the use of differential calculus. Concepts such as marginal cost, marginal revenue, and marginal productivity are modeled as mathematical functions to find optimal optimization points (Marginal Cost = Marginal Revenue).
Main Thinkers
The neoclassical school was initially formed from three independent foci that coincided in time:
- Alfred Marshall (1842–1924): The great systematizer of the school and professor at Cambridge. In his work Principles of Economics (1890), he combined the marginal utility of demand with the production costs of supply, creating the famous crossed curves graphs (the "Marshall's scissors").
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Léon Walras (1834–1910): Leader of the Lausanne School, he was the pioneer in mathematically modeling General Equilibrium, attempting to demonstrate through a system of simultaneous equations how all markets in an economy equilibrate at the same time.
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William Stanley Jevons (1835–1882): One of the first to strictly apply mathematical calculus to consumer utility, stating that economics is essentially a science of quantifiable pleasure and pain.
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Note on Carl Menger (1840–1921): Historically grouped in the original Marginalist Revolution. However, Menger rejected mathematization and static models, giving rise to the Austrian School, which methodologically bifurcated from the neoclassical mainstream.
Underlying philosophical vision
The neoclassicals are positivists and mechanists. They see the economy as a system of balanced forces (like Newtonian mechanics). The human being is an isolated rational maximizer (not an actor in time and uncertainty as in the Austrian School). History and institutions matter little; what counts is static equilibrium and universal laws. There is a strong methodological individualism, but combined with an aggregative and mathematical approach that dilutes true individualism.
Main criticisms
Austrian criticisms (Mises, Hayek, Kirzner, Rothbard)
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Equilibrium vs. Process: The neoclassicals study a state of static and unreal equilibrium. Reality is dynamic and disequilibrated. The true driver is the entrepreneur (Israel Kirzner) who discovers opportunities in uncertainty, not the fictitious “Walrasian equilibrium”.
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Perfect information: Impossible. Hayek in “The Use of Knowledge in Society” (1945) demonstrates that knowledge is dispersed, tacit, and changing; only the free market coordinates it through prices.
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Mathematical calculation: Mises and Hayek criticize the abuse of mathematics. Human action is not measurable like masses in physics (praxeology).
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Model failures: Ignores time, heterogeneous capital (Böhm-Bawerk), and the productive structure. Austrian business cycle theory shows that “equilibria” forced by the central bank generate bubbles and crises.
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Loss of radical subjectivism: Although they accept subjective value, the neoclassicals “objectify” it with curves and mathematical functions, betraying Menger's true subjectivism.
Other criticisms
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Keynesians: Neoclassical equilibrium does not explain involuntary unemployment or macroeconomic crises (insufficient aggregate demand).
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Institutionalists and historical: Ignores institutions, culture, and history (the economy is not “ahistorical”).
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Modern (behavioral) criticisms: Homo economicus is false; humans have cognitive biases (Kahneman, Thaler).
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Marxists and heterodox: Serves as an ideological justification of capitalism (although Austrians would say it is a lukewarm and defective defense).
Legacy
The Neoclassical School dominates current university teaching (microeconomics + neoclassical macro). However, from the Austrian perspective, it represents a partial advance (subjectivism of value) but also a setback by mathematizing and equilibrating what should be an analysis of the market process in real time. Mises summarized it: “Neoclassical economics is an economics without real human action”.
This article is part of the Basic Liberalism Course -> Module 4: Main Schools of Economics
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Last updated: 2026-05-17
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