Liberty’s history is often presented as a direct consequence of the Enlightenment: inherited authority was subjected to reason, persecution gave way to toleration, monarchy to constitutional government, and privilege to individual rights. In this account, classical liberalism leads naturally to Austrian economics and modern libertarianism. That sequence is useful but incomplete.
Liberty developed through the convergence of two lineages. The first is the modern lineage of Enlightenment criticism, which required political power to justify itself before reason. The second is an older realist tradition, running from Aristotle and Thomas Aquinas through the School of Salamanca, Richard Cantillon, Carl Menger, Eugen von Böhm-Bawerk, Ludwig von Mises, and Murray Rothbard. These thinkers did not form a single school, nor did they agree on every question. What connects them is a shared orientation: reality has an intelligible order, human action has a structure, and political power cannot be abolished either by command.
The relevant difference is not between the Enlightenment as a whole and an older tradition, nor between reason and faith. Important currents within the Enlightenment, especially the Scottish Enlightenment, recognized that custom, law, money, and markets could arise without deliberate design. The deeper conflict is between a constructivist current within modern thought and an older causal-realist approach to social order. Friedrich Hayek identified the pinnacle of this constructivism as the “fatal conceit,” the erroneous belief that man is able to shape the world around him according to his wishes. The realist tradition emphasizes the intelligibility and causal structure of social phenomena, while the constructivist tendency places greater confidence in deliberate organization and direction.
The danger appeared when criticism of inherited institutions hardened into confidence in consciously-designed ones. Locke was not Marx, and constitutional government was not socialism. The continuity lies in method: once social order is treated primarily as an artifact of design, political disagreement increasingly turns on the identity of the designer, the objective of the plan, and the permitted range of control. This tendency appears in social planning, price controls, central banking, licensing, regulation, and the administrative management of economic life.
The older lineage begins from a different premise. Aristotle started with beings as they are and the ends toward which they tend. Human beings choose, deliberate, employ means, form households, exchange goods, and enter associations. Thomas Aquinas carried this realism into law and politics. A command does not become just simply because a ruler issues it. Human law derives its normative order from principles that political authority does not itself create.
Many late Scholastics, particularly the Spanish Scholastics associated with Salamanca, extended this framework to property, exchange, money, and political authority. They increasingly identified the just price with common estimation, shaped by utility, scarcity, and market conditions, rather than with an objective measure of production costs. By situating economic phenomena within moral agency and commutative justice, they placed limits on the arbitrary exercise of political authority in economic life. Within this tradition, thinkers such as Juan de Mariana also articulated strong limits on taxation, confiscation, and monetary debasement.
Richard Cantillon advanced this analysis by placing entrepreneurship, uncertainty, production, and market-price formation near the center of economic life. Merchants and retailers bought at known or fixed prices and later sold at prices they could not foresee, while farmers committed themselves to fixed rents without knowing what their output would command. Profit, loss, and bankruptcy therefore arose from judgment under changing conditions of demand, competition, weather, and consumer preference.
Carl Menger marked a decisive transition within the Austrian tradition. Much of British classical economics, especially in the Ricardian tradition, explained long-run exchange value primarily through labor and production costs. Menger instead began with human needs and with the economizing individual’s knowledge of, and command over, goods capable of satisfying those needs. Value was not a substance stored inside an object; it arose from the relation between an individual, his needs, and the goods available to him. Market phenomena therefore had to be traced to individual judgments, choices, and exchanges. Prices, money, and other social institutions could emerge from economizing activity even when no one intended the resulting order.
Böhm-Bawerk extended the analysis to capital and time. For him, social or productive capital consists of intermediate goods used in time-consuming processes of production before final consumer goods become available.
Mises generalized the Austrian insight through praxeology, making economics part of a broader science of human action. The starting point was not an aggregate, a class, or a governmental objective; it was the acting individual employing scarce means to attain chosen ends. Exchange, prices, profit, loss, money, capital, and production are intelligible only within this structure of purposeful conduct. Mises presented praxeology as an a priori science grounded in the category of human action, with implications that could be developed through deductive reasoning independently of particular historical experience.
The extent to which this epistemology should be understood as Kantian, however, is contested. Jörg Guido Hülsmann has argued that Mises is better understood as a representative of Aristotelian realism. Although Mises employed the language of the a priori, Hülsmann points to the method of Mises’s actual economic analysis, which repeatedly seeks to identify the nature and necessary relations of economic phenomena. Hülsmann therefore places him within the broader Austrian realist tradition of Menger and Böhm-Bawerk, arguing that his affinities with Kant should not be overstated. On this reading, Mises occupies an intermediate position within the lineage developed here: his epistemological vocabulary is partly Kantian, while the substance of his economic analysis retains an important Aristotelian-realist character.
Mises’s critique of socialism demonstrated the practical consequences of this method. Socialist calculation does not fail merely because officials are corrupt, uninformed, or unintelligent. It fails because abolishing private ownership in the means of production eliminates genuine exchange in capital goods. Without exchange, there are no market prices through which planners can compare competing uses of resources by means of monetary calculation.
A planning authority may collect technical information, issue targets, and assign accounting figures. Such figures, however, are not exchange ratios generated by transactions among separate owners. A statistical table can describe quantities, but it cannot determine whether steel should be used for bridges, machinery, railways, or buildings in a way that responds to consumer demand and alternative costs. The defect is not located in the personality of the planner; it is built into the institutional structure of the system.
Rothbard brought this lineage to its most systematic political conclusion. He combined Austrian value theory, capital theory, and economic calculation with a broader theory of natural law, natural rights, property, and the state. His philosophical foundation differed from Mises’s. Rothbard retained the praxeological method of deduction but interpreted the action axiom from an Aristotelian-Thomistic epistemological standpoint, grounding it in the nature of reality rather than in Mises’s neo-Kantian conception of the action axiom as an a priori category of thought.
Rothbard also rejected the convenient story that economics began with Adam Smith and advanced in a straight line toward modern science. In his history of economic thought, he restored the Spanish Scholastics, Cantillon, the French liberal tradition, and other neglected thinkers to a central place, arguing that their contributions had been obscured by the later dominance of British classical economics.
The administrative state shows what happens when the emancipatory language of the Enlightenment is separated from the limits imposed by human action, scarcity, property, and economic calculation. It speaks the language of rights while turning rights into permissions. It recognizes property and permits markets while reserving the power to direct their use through zoning, licensing, taxation, monetary policy, and regulation. It preserves elections while transferring decisions to agencies, central banks, and experts. The system remains liberal in vocabulary and managerial in operation. Failure is treated not as evidence of institutional limits but as proof that the machinery requires another adjustment, a new rule, a larger staff, or a wider jurisdiction.
The history of liberty, therefore, is not the story of one Enlightenment becoming more consistent, but of two converging lineages. One challenged inherited authority; the other emphasized the limits that human action, causality, property, and economic calculation impose on deliberate construction. Austrian economics stands where they meet. Social order emerges through individual action, exchange, calculation, and cooperation under conditions that no central authority can fully command.
