1,549 works, 150 years of economic thought. Each one summarized and searchable, with cited passages inside.
Suppose the molecules in a physics laboratory suddenly began to speak — disputing the textbook account of Brownian motion, offering their own versions of events. Machlup’s parable dramatizes the one methodological difference he thinks genuinely separates social from natural science: the social scientist studies beings who talk, interpret, theorize, and lie about themselves. Rejecting both a wholly separate logic for social inquiry and the claim that no real difference exists, he refines Verstehen into the disciplined construction of models of purpose and belief that must also treat actors’ own testimony as data — data that may mislead. Bankers deny they create credit; businessmen reject profit-maximization; yet economics, he insists, cannot be learned by watching or interviewing, only through abstract constructs of purposeful action.
It is one of the characteristics of the natural sciences that their subjects of investigation do not talk about themselves.
When Richard Lester marshalled questionnaire evidence to argue that businessmen do not think at the margin, Machlup answered with this compact 1947 reply, reprinted here, that concedes almost nothing. Lester’s executives said employment depends chiefly on sales and orders; Machlup responds that sales expectations were always part of marginal productivity reasoning, not an antimarginalist discovery. He works through Lester’s six conclusions on wage rates, variable costs, factor substitution, and multiprocess plants, insisting that marginal analysis never required rising unit costs and that firms can reckon in incremental rather than average terms. His deeper charge is that Lester mistakes the proximate vocabulary of managers — orders, morale, sales effort — for a refutation of the causal structure economists actually analyze.
Incremental costs and revenues can be known without any knowledge of average costs and revenues; the reverse is not true.
Machlup’s presidential address returns to the 1946 American Economic Review battlefield twenty years on, asking not which theory of the firm is realistic but what each is built to explain. The governing distinction is between the firm as an analytical construct and the firm as an actual organization: competitive price theory uses a deliberately simplified agent to infer how prices and outputs move when wages or taxes change, and treating that fiction as a miniature General Motors commits the “fallacy of misplaced concreteness.” Behavioral and managerial models — Baumol’s sales maximization, Williamson’s expense preference — are not refutations but tools for different problems, above all monopoly and oligopoly, where discretion widens. His verdict is a disciplined pluralism that matches each model to the question it was designed to answer.
Thus, instead of a heated contest between marginalism and managerialism in the theory of the firm, a marriage between the two has come about.
Money, capital, law, psychology, method: Machlup reads more than fifty years of Hayek’s writing as one sustained inquiry into how coordination arises under limited knowledge — an appraisal offered here in Kurt Leube and Alfred Bosch’s German translation of his 1974 English essay, expanded with a biography and Nobel materials. He joins Hayek’s early Austrian-Wicksellian cycle theory, in which credit expansion lengthens production beyond voluntary saving and forces malinvestment, to the neglected Pure Theory of Capital and its intertemporal equilibrium. He follows the path from the Misesian calculation debate to the deeper problem of dispersed knowledge, where prices coordinate by economizing on what no central planner could ever gather. Of all Hayek’s fields, Machlup ranks capital theory first.
Wenn ich das Fachgebiet auszuwählen hätte, auf dem Hayeks Beiträge am fundamentalsten und bahnbrechendsten waren, dann fiele meine Wahl auf die Kapitaltheorie.
English translation: “If I had to select the field in which Hayek's contributions have been most fundamental and pathbreaking, my choice would fall on capital theory.”
No genuine reform of the international monetary system emerged from the 1976 Jamaica Agreement — so Machlup argues in this sharp commentary answering Dr. Slighton’s defense, which, read carefully, concedes nearly every charge the prosecution had made. The agreement supplies neither an adequate adjustment mechanism nor an orderly means of controlling international liquidity, and liquidity and adjustment, he insists, hang together: reserve-rich countries postpone correction while intervening ones inflate their money supplies. Against the claim that flexible rates impose their own discipline, he notes that internationally, borrowed reserves can enlarge the effective reserve base. He sketches three routes — rules on intervention, a gold-for-SDR substitution account, a Witteveen-style cap — and dismisses “politically impossible” as a temporary condition of education, recalling that dollar devaluation was once unspeakable.
Nothing of what I have said is well thought out: I have spoken impromptu. But I think we must have the courage of saying foolish things because, eventually, out of foolish things, wise things may be distilled.
To write the history of an idea, Machlup insists, is not the same as writing the history of the word attached to it — and “economic integration” is a young term for an ancient problem. Growing from his 1974 presidential address to the International Economic Association in Budapest, the book defines complete integration not by treaties or common markets but by the actual use of every potential opportunity for efficient division of labour. From that yardstick it ranges across customs-union theory, factor-price equalisation, optimum currency areas, and the Zollverein, deploying Viner’s distinction between trade creation and trade diversion to show that integration is not automatically beneficial. Its third part becomes an annotated genealogy of contributors, from Hamilton and List to Meade and Mundell.
In this interrelatedness and interdependence among all economic activities I see the essence of general economic integration.
Divisions of knowledge are neither timeless truths nor mere administrative convenience: they are historical settlements, shaped by intellectual expansion, cultural purpose, and institutional power. Tracing the ordering of learning from Aristotle's theoretical-practical-productive triad and Porphyry's tree through Bacon's division into History, Poesy, and Philosophy, Dewey's decimal notation, and the four-faculty structure of the medieval and modern university, Machlup shows how branches split, fuse, vanish, and reappear as erudition grows. He restores science to its broad continental sense against the narrow Anglo-American restriction to natural science, and defends intellectual knowledge pursued for understanding, culture, or delight rather than utility. The second volume of his Knowledge project makes the map of learning itself the object of study, insisting that every classification is provisional and that no partition should be mistaken for the essence of what it orders.
But knowing for fun is a respectable human activity; and having fun need not be judged useless.
'Autonomous' and 'induced' name positions in a causal story, not fixed labels stamped on the current account, the capital account, or official reserves. Against the habit of reading causation straight off the balance-of-payments table, Machlup insists that double-entry identities guarantee offsetting balances but explain nothing: a trade surplus is itself a capital export, and a current-account deficit is the logical correlative of a capital-account surplus rather than its cause. Using an oil-price shock to show that an importing country may cut consumption, raise exports, borrow, or draw down reserves, he weighs five rival doctrines of autonomy and ties each to a specific exchange-rate regime. His verdict is disciplinary: which flow dominates an episode must be established by historical and theoretical argument, never inferred from account headings alone.
Economists are prone to consider assumptions as almost perfect substitutes for knowledge, or perfect antidotes for ignorance.
The vitality of Mises's private seminar, set against Wieser's dull lectures, opens this interview's return to interwar Vienna, where Machlup wrote his dissertation and argued monetary theory, business cycles, and method with Kaufmann, Schutz, and Feigl. Looking back from 1980, he redescribes Mises's a priori economics as a domain of construction—powerful for the pure logic of choice, useless for predicting a concrete steel price—and holds that economics is most fertile in negative predictions and least trustworthy in regression and macro-forecasting. He names methodological individualism and subjectivism as the enduring core of Austrian economics once marginalism became universal, concedes that liquidationist advice failed politically in 1933, and turns Hayek's account of the stable 1920s price level and unsustainable investment against Friedman's neglect of relative prices and costs.
I would say methodological individualism and subjectivism are the most important of the whole lot. Marginalism is internationally accepted. No one is an Austrian just because he is a marginalist.
Confronted with Depression-era watchwords that promised quick relief—Ankurbelung, work-sharing, autarky, debt cancellation, demurrage money—this guide for the educated layman tests each against the interdependence of prices, costs, and capital. Machlup argues that credit expansion can simulate revival but, unmatched by real saving, only sustains investments the crisis has already condemned; that unemployment is at bottom a problem of enterprise profitability, not of a fixed quantity of work to be divided; and that protection granted to any branch of production is a national sacrifice paid by consumers and other producers. Defending gold as a restraint on discretionary credit and saving against consumptionist fashion, he closes on the socialist calculation problem: lacking market prices for production goods, no central plan can reckon. First published in Vienna in 1934.
Das Problem der Arbeitslosigkeit ist zur Hauptsache ein Problem der Rentabilität der Unternehmen.
English translation: “The problem of unemployment is, in the main, a problem of the profitability of enterprises.”
Before the knowledge economy could be measured, someone had to decide what counts as knowledge-producing activity—otherwise the category would swell to include everything or shrink to nothing. Machlup's foundational answer distinguishes the stock of knowledge held at a moment from the flow disseminated over time, and locates economic significance not in private discovery but in costly circulation: teaching, publication, research, professional service. He separates knowledge industries, defined by their output, from knowledge occupations, defined by the work performed in any industry whatsoever, and ranges across the types and qualities of knowing—practical, intellectual, pastime, spiritual, even unwanted. Opening an eight-volume expansion of his 1962 study, this first volume assembles the conceptual architecture—stock versus flow, generation versus dissemination, industry versus occupation—on which later analyses of human capital and information services would rest.
Generation of knowledge without dissemination is socially worthless as well as unascertainable.
Expensive to create, verify, and teach yet nearly free to reuse, knowledge resists efficient pricing—a tension that runs through this survey of information economics and human capital. Writing deliberately without a line of algebra, Machlup guides the reader through markets riddled with asymmetric information, from Akerlof's lemons to adverse selection and moral hazard, through public goods and the free-rider problem, and back to the Mises-Hayek socialist calculation debate and the dispersed knowledge that no central board can gather. He accepts a weak rational expectations while rejecting the strong version as granting agents superhuman powers, and narrows human capital to investments built into persons alone, distinct from tools and disembodied knowledge. The third volume of the Knowledge project, published after his death, completes it.
I have set for myself the task of writing without a single line of algebra, even where this constraint should make it impossible to give a proper presentation of an author’s ideas.