The archive.

Expert agreement on postwar economic cooperation did not guarantee that governments would make it possible. This gap shapes Gottfried Haberler’s 1946 review of the conference addresses collected by Arnold J. Zurcher and Richmond Page. Appreciative of the volume’s quality, Haberler tests its proposals against political constraints and uneven economic adjustment. Should aid be withheld if outright gifts cannot win approval? Can aggregate spending resolve unemployment in depressed regions? His sharpest qualifications concern cartel restrictions sustained by tariffs and optimistic accounts of Britain’s economic prospects. This compact review offers a concrete example of Haberler’s critical method: distinguish desirable principles from feasible policies, and welcome challenges to prevailing opinion without accepting assertions in place of supporting argument.

The gap between theoretical competence and usable economic analysis shapes Gottfried Haberler’s brief review of Hans Böhi’s study of postwar equilibrium exchange rates, prepared for the Swiss government. Haberler credits Böhi’s command of international trade theory and his recognition that price-and-cost comparisons cannot provide an unrestricted purchasing-power-parity rule. Yet he questions an exposition that treats quantitative relationships entirely in words, omits references, and gives familiar terms such as elasticity unusual meanings. Written without knowledge of the Keynes and White plans, the study also stands apart from the monetary debates its subject demands. The review offers a compact example of Haberler’s critical standards: sound theory must also make its reasoning accessible and establish its policy bearings.

An equation can be true at every instant yet fail to explain how income changes. This distinction anchors J. J. Polak and Gottfried Haberler’s brief joint restatement, written to reconcile their preceding contributions on the foreign-trade multiplier. They favour an exports-based multiplier for tracing income adjustment under specified conditions, while warning that an export-surplus formula’s validity as an identity does not establish its causal usefulness. Their treatment of consumption makes the difficulty concrete: a stable relationship between current consumption and previous income need not imply a stable ratio of current consumption to current income. The statement offers a compact lesson in what multiplier reasoning requires—explicit timing, defensible assumptions about constant parameters, and restraint where the available relationships cannot support a general prediction.

Ten years after The General Theory appeared — and in the year of Keynes's death — Haberler set out to weigh the book as a scientific system rather than an object of discipleship, a verdict he revisits sixteen years on without softening it. He grants Keynes the systematic use of income effects, the multiplier, and a transformed vocabulary of macroeconomic model-building, but denies any overturning of monetary and cycle theory's logical foundations. The demonstration of a static competitive underemployment equilibrium, he argues, rests entirely on money-wage rigidity; admit flexible wages and the Keynes and Pigou effects erode it. Say's Law, properly stated, had already been abandoned by serious neoclassical theorists. Praise without idolatry is the essay's discipline.

Hero worship is nowhere less appropriate than in science.

A devalued currency may pull the exchange market back toward balance or drive it further from it, and telling the two cases apart is the whole problem here. Haberler builds a static two-country skeleton, deriving the demand and supply of foreign currency from underlying import and export schedules and defining stability by how a deficit responds to a falling exchange rate. A negatively inclined supply curve of foreign exchange, he shows, can make depreciation worsen the very deficit it was meant to cure. Recasting the Marshall-Lerner condition as a special case of a broader exchange-market stability rule, he insists that currency-market curves must never be confused with the commodity curves beneath them, and resists the 'elasticity pessimism' of postwar dollar-scarcity debates.

But the free price mechanism could not achieve that result; it would drive the exchange rate in the wrong direction.

Rebuilding a scholarly discipline after a world war is partly a matter of statutes, dues, and committee votes — and this report captures economics doing exactly that. Writing for the American Economic Association, Haberler argues for joining the newly forming International Economic Association, whose design meets the conditions Princeton had set: a modest structure resting on existing national bodies, financed but not governed by UNESCO, and cheap to support at $200 in annual dues. He recounts the April 1949 Paris meeting, the draft statutes reviewed paragraph by paragraph, and the interim slate of officers awaiting the Council's confirmation. Behind the procedural surface lies a real transition: economics reconstituting itself as an organized international profession through deliberately limited cooperation.

In accordance with the Interim Arrangements provided in the Draft Statutes, the Interim Committee nominated Professor Schumpeter as President, M. Rueff as Vice President, and Ronald Walker (Australia) as Treasurer of the I.E.A.

Haberler builds the theory of comparative cost from a two-country, two-commodity opportunity-cost model, then presses on the imperfections that critics invoke to justify protection. A mere catalogue of deviations from the competitive ideal, he insists, proves only possibility, not necessity: factor immobility alone leaves trade welfare-improving so long as factor prices stay flexible, and it is rigid wages—especially those maintained by unions—that generate the unemployment which can make trade inferior to autarky. Even then protection is a second-best, largely short-run remedy. He extends the same discipline to external economies, showing how unrecognised ones can make a country appear to hold a comparative advantage in the wrong commodity, and to the infant-industry argument, which he accepts in principle while noting it can equally counsel freer trade.

It can be easily shown, however, that what really causes trouble and may make trade detrimental and justify protection is rigidity of factor prices, which may or may not be associated with immobility of factors.

International trade is governed proximately by money prices and money costs, yet exchange-rate complications and pre-trade cost comparisons make the doctrine of comparative advantage easy to misread. Setting the Marshall-Viner real-cost approach against opportunity cost—which he defends as a workable approximation to general-equilibrium theory—Haberler concedes that increasing returns, monopoly, wage rigidity, and external economies all qualify the free-trade case, then argues that liberal policy remains preferable precisely because interventionist systems obscure the comparative costs on which rational choice depends. The paired concluding remarks turn to the postwar dollar shortage, where he sides with the optimists against structural pessimism, credits the 1949 sterling devaluation and disinflation with vindicating the classical adjustment mechanism, and rejects discriminatory restrictions against dollar goods in favour of non-discrimination and the most-favoured-nation principle.

Non-discrimination like honesty still remains the best policy.

At the heart of Schumpeter's theory of capitalist development lies a startling doctrine: a stationary circular-flow economy would have a zero rate of interest, and the positive rate observed under capitalism springs entirely from innovation financed by newly created bank credit. Haberler weighs this extreme version against a milder one and finds the extreme untenable, since it demands both the absence of time preference and zero marginal productivity of capital, assumptions he doubts once routine investment and ordinary impatience are admitted. Yet he defends Schumpeter's larger dynamic account, ranking its disequilibrium approach above the excessively static equilibrium theory of Mises and Hayek, who deny that credit expansion can permanently enrich the capital stock. The comparative question of whether dynamics raises or lowers interest, he concludes, is a comparatively unimportant detail.

The extreme version of his theory is hardly acceptable.

That devaluing a currency must worsen a country's terms of trade was, in 1952, an assumption widely taken for granted, and this compact theoretical note, reprinted here, sets out to dismantle it. Haberler's thesis is deliberately asymmetrical: in the normal case, where depreciation improves the balance of payments, the terms of trade may move either way and cannot be predicted a priori; only in the perverse case, where the balance of payments worsens, must they deteriorate. Working through demand and supply curves priced in dollars, he shows that a depreciation lowers both export and import prices measured in dollars, so one cannot pair dearer imports with cheaper exports and infer a loss. Against Joan Robinson's presumption that supply elasticities generally exceed demand elasticities, he denies that any broad generalization holds.

We have, then, the result that export and import prices move in the same direction.

Critics had turned the Pigou effect into a crude prescription for curing depressions by driving wages and prices down; Haberler writes to rescue it from that caricature. Properly understood, he argues, it is not policy advice at all but a theorem about the internal consistency of the static Keynesian model. In a world of flexible competitive wages, the Keynes effect normally restores full employment through falling interest rates; the Pigou effect closes the extreme remaining cases — a liquidity trap, interest-insensitive investment — by letting rising real balances lift expenditure. This dismantles the one strict basis for a static competitive underemployment equilibrium and undercuts secular stagnation, even as Haberler concedes to Hansen and Metzler that real depressions demand monetary and fiscal action, not patient deflation.

For these two reasons it would be foolish to rely entirely on price and wage deflation to cure a depression through the Pigou effect.

Surveying business-cycle theory at a moment when the field was fragmenting into rival methods, Haberler imposes order with a single 'modest hypothesis': fluctuations in effective demand are the immediate cause of cyclical swings in output and employment. Written in German, the essay insists this is no narrowly monetary claim — Keynesian, Wicksellian, Austrian, and Schumpeterian accounts all fit beneath it — and reformulates the demand-output link through the elasticity of aggregate supply. He treats Hicks's multiplier-accelerator model as the synthesis's high point yet rejects any mechanical accelerator, keeping only the weaker claim that rising income stimulates investment. The essay's sharpest thrust names the Achilles heel of all Keynes-inspired theory: rigid prices and wages, and an aggregation so coarse it hides the structural maladjustments between production and demand.

Es ist den modernen Konstrukteuren mathematischer Modelle vorbehalten geblieben, über alle diese Dinge hinwegzusehen und ein mechanisches Funktionieren des Prinzips anzunehmen.

English translation: “It has been left to the modern constructors of mathematical models to overlook all these matters and to assume a mechanical operation of the principle.”