The archive.

When John von Neumann published his expanding-economy model in 1937, he gave economics one of its rare transformative events. Morgenstern and Thompson build on it here, synthesizing two decades of work into the KMT model, which removes von Neumann's restrictive assumption that every good figures in every process and admits multiple expansion rates, subeconomies, and game-theoretic solution methods. Across fourteen chapters they extend the framework to open economies that import and export at world prices, to consumption and savings, to trading blocks and a world model bound by a common expansion rate, and, pointedly, to contraction and compression, since resource limits make endless growth no longer self-evidently desirable. Throughout, they insist the models apply to any economy regardless of political organization, deliberately omit money and stochastic elements, and treat expansion, stationarity, and collapse as problems of structure, optimization, and computable linear programming.

Did OPEC's quadrupling of crude prices really cause the stagflation of the mid-1970s? Haberler's answer, developed as the lead paper of this symposium, is a firm no: the oil shock was costly but not the master cause. Dearer oil imposes a terms-of-trade loss that a flexible economy would absorb through a once-for-all fall in real income; only downward-rigid money wages convert it into unemployment or inflation. The shock, he argues, struck an economy already destabilized by an unsustainable boom. On the international side he deflates fears of the 'petrodollar,' since OPEC surpluses must return as purchases or investment and the Euro-dollar market had already recycled them. Rejecting official schemes that quarantine oil deficits from the rest, he insists each country confront its overall balance of payments through floating, IMF borrowing, or domestic monetary and fiscal measures.

The oil price rise was not a major factor in bringing on inflation and recession.

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.

Money re-enters general economic theory through individual action, marginal utility, and market exchange unfolding in time; that is the thread Rothbard follows in reconstructing Mises's monetary theory, which he traces to the 1912 Theory of Money and Credit. The demand for money becomes the demand to hold cash balances, and its purchasing power a heterogeneous array of exchange ratios rather than the inverse of some measurable price level. At the theoretical center stands Mises's regression theorem, which dissolves the apparent circularity of money's value by tracing it back through time to a commodity once valued for direct use. Along the way Rothbard turns the analysis against index-number thinking, Walrasian equilibrium, and government credit expansion, defending commodity money as the one check on political creation of purchasing power.

Every good and service will have an almost infinite array of prices in terms of every other good and service.

Behind Theory of Games and Economic Behavior lay a convergence of two unfinished programs. In this memoir, Morgenstern retraces the path from his 1928 work on economic forecasting, where the distinction between "dead" and "live" variables already anticipated strategic interaction and the Sherlock Holmes and Moriarty chase exposed the paradoxes of perfect foresight, to a Princeton encounter he describes as an instantaneous meeting of minds. What began as a short explanatory article grew, through walks and longhand collaboration, into a book that axiomatized expected utility, deployed minimax reasoning, and turned to convexity after his discovery of Jean Ville's proof. He recounts the Vienna Circle background, von Neumann's expanding-economy model, wartime printing by Princeton University Press, and the reviews and translations that followed, an origin story of game theory that doubles as a memorial to a friendship.

We did an enormous amount of work in a very short time, but it was unceasing pleasure and never a time of drudgery.

Stagflation, rapid inflation coexisting with substantial unemployment over a considerable period, was not supposed to happen, and the 1974-75 recession, the first worldwide postwar slump, made the anomaly impossible to ignore. Haberler treats it not as a natural feature of competitive markets but as the symptom of institutional obstruction: downward wage rigidity, union bargaining, indexation, farm supports, and regulation prevent relative prices from adjusting. Special factors like the oil and food shocks, he calculates, explain perhaps a fourth of the two-digit inflation; the rest is real-wage resistance by organized groups. His prescription is structural reform to enlarge competition, dismantling marketing orders, Davis-Bacon rules, the Buy American Act, and minimum-wage laws that price out the young, rather than incomes policy or election-year stimulus, which would only reignite inflation and invite the wage-price controls that lead toward rationing and planning.

The policy dilemma of stagflation is this: If macroeconomic monetary and fiscal policies try to counteract inflation, they increase unemployment; if they try to reduce unemployment they intensify inflation.

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.

Friedman's proposal for a legislated rule fixing steady annual growth in the money stock is the target here, though Hazlitt takes care to salute the free-market economist behind it. Monetarists are right that money matters, he grants, but wrong to lean on a mechanical quantity theory: the value of money, like any good, is set by supply, demand, and subjective valuation, not by the arithmetic of MV = PT. He walks through the three stages of inflation, argues that a currency's quality and its holders' expectations move prices as surely as its quantity, and exposes 'velocity' as an after-the-fact excuse. The fatal defect, though, is political, hand the money supply to legislators and every recession becomes an argument for printing more.

So far as quantity is concerned, it is the expected future quantity of money, rather than the immediately existing quantity, that determines the exchange value of the monetary unit.

Neo-Ricardian critiques advancing, neoclassical theory unsettled, Keynesianism itself in crisis: economics in the mid-1970s struck Lachmann as a discipline in turmoil, and his answer is a deliberate act of dissent. In an age of divergence, he argues, a distinctly Austrian voice must be raised before its insights dissolve into the neoclassical synthesis. Hicks having preempted 'neo-Austrian' with a theory resting on static expectations and a single good, Lachmann simply reclaims the plain word Austrian. He grants the neo-Ricardian exposure of circularity in aggregate capital measurement yet faults its retreat to objective cost, and locates the real quarrel elsewhere: not mathematics but knowledge. Where neoclassical theory treats knowledge as a given datum and presumes universal market awareness, Austrian economics studies the market as a process that diffuses, creates, and renders knowledge obsolete.

When factions are already in existence, who can be blamed for being factious?

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.

To demand that society be redesigned whole, according to chosen ends, is what Hayek calls constructivism, the modern illusion of Machbarkeit this 1977 lecture sets out to destroy. Social justice, he argues, is an atavism: the moral instincts bred in small hunter-gatherer bands, projected onto the anonymous order of the Großgesellschaft. Prices are not just rewards for what we have done but signals of what we ought to do next, and no one holds a moral claim to a particular market value, since that value emerges from thousands of circumstances no mind can survey. Competition works as a discovery procedure drawing on more knowledge than any planner commands. To enforce a just distribution would demand totalitarian control, cripple productivity, and, he warns with Hölderlin, turn the state made heaven into hell.

Frühere Generationen haben sich noch nicht der Illusion hingegeben, daß sie ihre gesellschaftliche Umwelt völlig nach Wunsch gestalten können.

English translation: “Earlier generations had not yet indulged the illusion that they could shape their social environment entirely according to their wishes.”

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.