The archive.

Empirical critics of the 1940s claimed that interviews and questionnaires had caught firms behaving in ways marginal analysis could not explain; the reply here is that they had misunderstood the theory they meant to refute. Economic theory, Machlup argues, is essentially a theory of adjustment to change, and its variables are the entrepreneur's own expected costs and revenues, not the observer's accounting magnitudes — a driver overtaking a truck responds to speed and distance without computing them. Reports of 'full-cost' pricing dissolve on inspection: average cost may smooth fluctuations over time, discipline a cartel, or hint at rivals' demand elasticity without contradicting marginalism. He is hardest on Richard Lester's wage-employment surveys, whose 'importance' ratings confuse frequency with marginal effect. The theory has not been disproved, he insists, though better empirical work, grounded in theory, is badly needed.

The business man does what he does on the basis of what he thinks, regardless of whether you agree with him or not.

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.

Sealed bids for cement and steel that match to the penny are no accident but the signature of a pricing formula — and this 1949 study, rushed out after the Supreme Court's Cement Institute decision, anatomizes how that formula works and why it should go. Under basing-point pricing a delivered price is reckoned from a designated base point whether or not the goods ship from there, so 'phantom freight' and 'freight absorption' erase local cost advantages and make rival quotations converge. Machlup treats this as geographic price discrimination and, tracing case histories in steel, cement, and corn products, as a cartel embedded in freight books and classifications rather than open conspiracy. Against warnings of chaos he sets uniform f.o.b. mill pricing, under which distance again becomes visible and buyers can hunt for genuinely cheaper sources.

Almost all economic change leaves some people worse off.

In 1906 Schumpeter defended mathematical economics; in 1949 he pleaded for historical analysis — a reversal only in appearance, Machlup argues, for the man never lost the one nor lacked the other. What held across four decades was a disciplined pluralism: theory, statistics, and history each earn their keep on the problems they suit, and the sectarian spirit of the Methodenstreit, which made each camp treat its method as the only scientific one, was the real enemy. Machlup follows Schumpeter from bare functional relations toward an eventual acceptance of causal language, and shows how the split between statics and dynamics turns methodological choice into substantive economics: equilibrium explains the circular flow, while the entrepreneur's discontinuous innovation drives development. Methodological individualism, he stresses, is a rule for building explanations, not a creed of laissez-faire.

It follows that the claim usually made for statistical induction and verification must be qualified. Material exposed to so many disturbances as ours is, does not fulfill the logical requirements of the process of induction.

For the seller who feels himself one among very many, rivals are colleagues rather than threats—and it is this state of mind, not the sheer count of firms, on which Machlup rebuilds the theory of selling. He coins pliopoly for the pressure of potential newcomers, setting it beside polypoly, oligopoly, and monopoly, and defines a true monopolist by the triple absence of all three. Against businessmen who claim they price by average or full cost, he reinterprets such rules as competitive responses to expected demand elasticity, treating cartel ethics and break-even charts as evidence rather than refutation. The analysis ranges across perfect and imperfect polypoly, artificial scarcity and monopoly rents, and the kinked demand curve, always parting the economist's objective calculus from the trader's rough feel for the market.

The concept of the industry is nothing but an expedient device for ruling out negligible or too uncertain interdependence.

Monopoly, in this account, is less a market form than an institutional problem: every arrangement by which alternatives are restricted — business combinations and buyer power, union control of labor markets, and above all government policies that shelter favored groups from competition. Machlup credits antitrust with making cartel agreements less secure, yet judges the law of monopolization, the prohibition of trusts and mergers, a dismal failure. His sharpest reversal is that monopoly is often a product of public permission, manufactured through licensing, tariffs, patents, and marketing orders. He carries the same logic into labor, rejecting the purchasing-power theory of wage increases and denying that union monopoly offsets business monopoly — their effects, he argues, are additive rather than compensatory. First published in 1952, it remains his most sustained brief for open entry.

The economic policies of government are far-flung and many-sided. On many fronts, therefore, could government fight for competition and against monopoly if it so desired. It has not seen fit to do so.

Can devaluation cure a trade deficit? The mid-century answer split into two camps, and this 1955 article refuses to let either win outright. Against Sidney Alexander's claim that his 'income-absorption' approach supersedes the older elasticities method, Machlup grants the weaknesses of relative-price reasoning — supply and demand curves for foreign exchange shift once devaluation changes costs and incomes — but shows that the accounting identity Y ≡ A + B, however clarifying, is no causal theory. Alexander's gravest omission is resource reallocation: devaluation can raise real income by moving resources into more valuable uses, an effect no marginal propensity to absorb can capture. Reasoning from identities, Machlup warns, tempts the analyst into implicit theorizing. Neither set of tools can be spared; both relative prices and aggregate spending are needed.

The trade balance is negative when the nation absorbs more than its income.

Between apriorism and a crude empiricism that would test every assumption in isolation, Machlup marks out a middle path for what 'verification' can mean in economics. He lowers the stakes deliberately: verification is not access to final truth but a disciplined comparison between what a theory implies and what inquiry discloses. His pivotal distinction separates particular historical propositions, checkable directly, from general hypotheses that yield conclusions only when joined to auxiliary assumptions about conditions and change. Fundamental postulates such as rational action need no independent sense-verification; they make conduct intelligible and are judged by the fruitfulness of the systems they support. Steering past both Misesian apriorism and Hutchison-style ultra-empiricism, and drawing on physics, Einstein, and Braithwaite, he holds that economics stays empirically disciplined while a hypothesis, at most, survives as not disconfirmed.

The hypothesis is confirmed if reasonable correspondence is found between the deduced and the observed, or more correctly, if no irreconcilable contradiction is found between the deduced and the observed.

A country may be poor with no promising resources to develop, or rich while sitting on vast undeveloped opportunities — 'how splendid to be rich and yet underdeveloped,' Machlup remarks, and the irony sets the tone for this 1957 map of development economics. Rather than treat 'economic development' as one measurable thing, he sorts the field's quarrels into disputes over definitions, objectives, recommendations, and theories, showing that total income, income per head, output per worker, and mass living standards can each move in opposite directions. Ends get confused with instruments: full employment, industrialization, and 'economic independence' harden into doctrines prized for their own sake. Behind the policy clashes he finds contested theories — autarky, infant-industry protection, balanced growth, terms-of-trade strategy — and asks of each exactly what exception to comparative advantage is being claimed.

The recommendation of labor-saving, capital-using investments in countries with abundant labor and scarce capital is a genuine paradox.

The slim volume in which Hicks reworked the demand theory of Value and Capital gets a patient, skeptical reading here. Machlup follows Hicks through weak ordering, the derivation of the law of demand, and the awkward Giffen case that requires an inferior good, a small substitution effect, and a large budget share at once. He sorts out the four consumer's surpluses Hicks had once collapsed into one, the First and Second Substitution Theorems, and the reciprocity of cross-effects. His verdict is measured: the revisions change neither policy nor prediction, but they honor Occam's razor by resting demand theory on fewer primitive terms, an important reconstruction, he grants, though difficult and joyless to read.

An important book is sometimes enjoyable to read. Unfortunately this cannot be said about this book.

Grant an inventor exclusive rights over a new process, and you plant a monopoly in an economy that otherwise prizes competition, the tension Machlup was asked to weigh when the Senate patent subcommittee commissioned this study. He traces the institution from Venice's 1474 law and England's Statute of Monopolies through the free-trade antipatent movement of 1850 to 1873, when the Netherlands actually repealed its patent law, and dissects the four classic defenses: natural property in ideas, monopoly as just reward, monopoly profit as incentive, and disclosure traded for temporary exclusivity. His conclusion is a famous refusal to conclude, that on present knowledge economics can pronounce the system neither a clear gain nor a clear loss to society.

To confuse an important invention with the patent that excludes people from using it is like confusing an important bridge with the tollgates that close it to many who might want to use it.

'Equilibrium,' in Machlup's hands, is a word doing too many jobs at once: a literal accounting balance, a methodological device for isolating cause, a description of durable historical states, and a smuggled value judgment. The confusion, he argues, comes from sliding among these senses unawares. To label a situation observed in the world an equilibrium commits what he calls the fallacy of misplaced concreteness, since the same facts fit rival models as equilibrium or disequilibrium; to build full employment or price stability into the definition is disguised politics. He carries the critique into international trade theory, praising Joan Robinson's relativism while faulting Nurkse, Ellsworth, and Kindleberger for defining the equilibrium exchange rate through the very policies they happen to favor.

Equilibrium is not a Good Thing, and disequilibrium is not a Bad Thing.