The archive.

Capital has no measurable counterpart among material objects; it exists only in the entrepreneur's appraisal of heterogeneous goods—and from that premise Lachmann builds an entire theory. Against the aggregate 'quantity of capital,' he substitutes an ordered pattern of capital combinations, deriving multiple specificity, complementarity, and finally capital structure from the plain fact that capital resources are heterogeneous. Expectations are interpretive acts, not mechanical data; prices communicate knowledge but must be decoded, some movements meaningful and others functionless. Process analysis follows plans through disappointment, regrouping, and fresh disequilibrium, while forward markets and the Stock Exchange help coordinate divergent expectations that price rigidity would betray. Reinterpreting Böhm-Bawerk's roundaboutness as changing composition rather than more time, and applying the framework to the strong boom, this 1956 work makes capital theory a study of order, failure, and regrouping.

The Theory of Capital is, in the last resort, the morphology of the forms which this pattern assumes in a changing world.

Written as Keynesian ascendancy pushed Austrian cycle theory to the margins, this reconstruction insists that its critics had mistaken its character: the theory is not a static contrast between saving and credit but a dynamic account of how investment reshapes the interdependence of industries over time. Its hinge is irreversibility—investment transforms fluid resources into specific, complementary capital that mistaken expectations can no longer unwind. Lachmann gives the theory a sectoral anatomy of consumers' goods, equipment, raw-material, and 'dynamic key' industries, and joins the Lundberg effect to the Ricardo effect to show how falling real wages during a boom divert entrepreneurs from long-period deepening toward speculation. Candid about limits, he finds the nineteenth-century railway booms fit the model but concedes that the 1929 crisis, with its stable prices and rising raw-material stocks, does not.

Once "free Capital" has been converted into buildings and machinery, any failure of events to conform to expectations will upset everything.

A convincing account of a crisis need not rest on a convincing theory of economic change. In this review of Thomas Wilson’s Fluctuations in Income and Employment, Ludwig Lachmann praises much of the analysis of American fluctuations while challenging the theoretical synthesis behind it. His objections are concrete: raw-material shortages can interrupt expansion, industrial equipment differs in age and productivity, and expectations cannot simply be treated as given. These concerns sharpen his defence of Austrian cycle theory against what he regards as Wilson’s static assumptions. The review culminates in a question that reaches beyond their disagreement: if investment opportunities are exhausted, what explains the human effort through which new ones arise? Readers encounter a compact example of Lachmann testing economic explanation against changing resources and purposeful action.

How can economists measure the gains from technical progress when innovation changes the capital they are measuring? In this 1942 review of Spurgeon Bell’s Productivity, Wages, and National Income, Ludwig Lachmann welcomes evidence on American productivity and income distribution while challenging the accounting used to interpret it. He singles out Bell’s finding that, after 1933, productivity gains accrued to wage earners rather than consumers and profit recipients. His sharper objection concerns comparisons of capital across periods marked by idle capacity, asset write-downs, and machinery replaced before it wears out. This compact review shows why, for Lachmann, empirical detail and theoretical criticism belong together: a study can document technological change yet conceal its effects through the measures it employs.

What should a rigorous theory of competitive price explain—and where does clarity leave questions unresolved? In this brief 1943 review of George J. Stigler’s textbook, Ludwig M. Lachmann welcomes an exposition shaped by Frank Knight’s teaching, particularly its consistent treatment of costs as foregone alternatives. His praise makes the reservations revealing: expectations raise a problem of determinateness that Stigler scarcely recognises, while inventories unsettle the rigid distinction between short and long run without prompting a sufficiently developed analysis of time. Lachmann calls these minor defects, not grounds for rejecting the book. The review offers a compact view of his critical priorities: conceptual consistency deserves recognition, but expectations and time demand more than tidy exposition.

Can a critic of political myths remain captive to one himself? In this 1943 review of Gustav Stolper’s This Age of Fable, Ludwig M. Lachmann applauds an assault on economic and political formulas of both Right and Left, but challenges its picture of security before 1914. For Lachmann, nationalist agitation had already undermined Austria-Hungary and the precarious European balance: national self-determination belongs among the promises requiring scrutiny, not outside them. This brief review brings his conception of historical inquiry into focus—recovering human purposes and plans beneath inherited world-pictures—and shows how that standard turns admiration into a precise objection to Stolper’s historical frame.

How can expectations enter a science of action when the future is uncertain and every observable fact admits rival readings? The answer here refuses two easy paths: against Keynes, Morgenstern, and Myrdal, Lachmann denies that expectations are ultimate data like tastes and resources; against Lundberg and Schumpeter, he denies they can be deduced from objective business situations. A price rise may signal reversion or inflation, so meaning arrives only through the actor's interpretation, and economics needs ideal types and historical understanding rather than deterministic law. From this he builds a theory of plan-guided action and tests it on Hicks's elasticity of expectations and on interest-rate formation, concluding that an Austro-Wicksellian crisis requires a particular expectational climate. The essay makes intelligibility, not determinateness, the proper aim of social science.

The Social World consists not of facts but of our interpretations of the facts.

Why does one price movement leave expectations unchanged while another forces people to rethink the future? In this article, Ludwig Lachmann distinguishes measuring the responsiveness of expectations from explaining it. Against accounts based on fixed psychological sensitivity or a single expected price, he examines the range of outcomes people consider plausible. A movement near its boundary may encourage expectations of reversal; a movement beyond it may undermine the very assumptions on which a forecast rests. His distinctive claim is that expectations arise through interpretation: people diagnose the forces at work before predicting their effects. The article shows why identical numerical changes can carry different economic meanings—and why a narrow range of expectations can both stabilise a market and make its eventual disruption more abrupt.

The formation of expectations is always incidental to the diagnosis of the situation in which we find ourselves; no prognosis without diagnosis.

Dispersed ownership may explain why salaried managers gain power, but it does not identify who actually exercises entrepreneurial judgement. This distinction anchors Ludwig Lachmann’s 1946 review of Robert Aaron Gordon’s Business Leadership in the Large Corporation. Welcoming Gordon’s evidence from American corporations, Lachmann presses him on the boundaries between initiating decisions, approving them, and coordinating an organisation. The return of commanding individuals during corporate crises complicates any simple account of entrepreneurship dissolving into managerial routines. His praise also stops short of endorsing Gordon’s proposed governmental approval of directors: a pointed reference to Nazi German company legislation challenges that remedy. This compact review distinguishes the economic explanation of managerial authority from the unresolved problem of controlling it.

"Separation of ownership and management" tells us nothing about the location of the entrepreneurial function within the managerial hierarchy.

Democratic consent cannot simply be assumed—but can discussion establish the values on which a free society depends? In this 1947 review of Frank H. Knight’s Freedom and Reform, Ludwig M. Lachmann admires Knight’s resistance to easy answers while probing the gap between cooperative truth-seeking and political debate. His sharpest disagreement concerns methodological individualism: against Knight’s demand that it account for society’s formation of individuals, Lachmann argues that scientific analysis isolates conceptual elements rather than explaining concrete social life in its entirety. The review offers a compact encounter between two defenders of freedom who disagree about its philosophical and analytical foundations. Readers can discover why securing agreement, validating values, and explaining purposeful action are distinct problems—and why conflating them weakens the case for a free society.

Complementarity and substitution are not, Lachmann argues, symmetrical static relations between factors: complementarity is the coherence of means within a single production plan, while substitution is the response to disruption, error, or revised expectations. A locomotive substitutes for another locomotive yet complements wagons, crews, tracks, and timetables—so which relation holds depends entirely on the plan through which the goods are read. Beginning from the Hicks-Lange-Harrod debate but pulling the question out of demand analysis and into the structure of production, this early essay dissolves the fiction of homogeneous capital without collapsing into mere physical classification. Capital goods are artifacts made for purposes; spare parts, standardization, and reserve capacity are not accidental frictions but devices for preserving a wider pattern of complementarity. Accumulation, working through chain reactions of gain and loss, makes any single rate of profit meaningless.

We have to provide for many minor changes in order to prevent a major one.

Economics is a science, a social science, and an analytical social science—Lachmann's 1950 inaugural lecture unfolds each claim in turn. As science it seeks systematic, value-free generalizations about observable phenomena, leaving judgments of the good to philosophy; as social science it studies not a special material object called man but phenomena—prices, output, employment—intelligible only as consequences of human choice under scarcity. Borrowing Robbins's ends-and-scarce-means framework, Lachmann insists economics is not psychology: it analyzes the logical implications of choices once made, not the motives behind them. Its method is compositive, tracing complex phenomena back to the plans that compose them, so that even failure becomes intelligible only by reconstructing the plans that failed. The lecture also polices history, warning against pseudo-explanations that personify 'Capitalism' or 'Industrialization,' and denying that any single invariant 'Trade Cycle' exists.

The Logic of Action is essentially a Logic of Success.