Gottfried Haberler, “Bemerkungen zum gegenwärtigen Stand der Konjunkturtheorie” (1953)

Haberler’s essay surveys business-cycle theory at a moment of methodological expansion, but its purpose is not encyclopedic. It imposes order by returning to a basic empirical regularity: cyclical movements in output and employment normally move with the money stream, prices, and effective demand. He begins from a deliberately narrow definition:

Unter Konjunkturzyklen verstehen wir Schwankungen des Produktionsvolumens und Beschäftigungsgrades.

English translation: By business cycles we mean fluctuations in the volume of production and the degree of employment.

The central thesis is “modest” but strategic: fluctuations in effective demand are the immediate cause of cyclical fluctuations in output and employment. Haberler insists that this is not a narrowly monetary theory, since the sources of demand fluctuations may be “real” factors, innovations, investment plans, fiscal changes, or expectations. This move lets him connect Keynesian, Wicksellian, and even Schumpeterian accounts under one causal framework.

Die bescheidene Hypothese, daß Schwankungen in der effektiven Nachfrage den Konjunkturzyklus unmittelbar verursachen, ist durchaus vereinbar mit zahlreichen nicht monetären Theorien und wird von ihnen impliziert.

English translation: The modest hypothesis that fluctuations in effective demand are the immediate cause of the business cycle is entirely compatible with numerous non-monetary theories and is implied by them.

The first section develops the conditions under which this thesis is meaningful. It is not a tautology unless wages and prices are perfectly rigid; nor is it universally valid under full employment. Haberler reformulates the problem through aggregate supply elasticity: demand changes affect quantities where supply is elastic, and prices where supply is inelastic.

je elastischer das Angebot, desto größer die Produktionsveränderung, je unelastischer, desto größer die Preisverschiebung.

English translation: The more elastic the supply, the greater the change in output; the more inelastic it is, the greater the shift in price.

The second section turns to the Keynesian cycle models, especially Hicks, whose work Haberler treats as the clearest representative of the multiplier-accelerator synthesis.

Die moderne, auf KEYNES aufbauende Konjunkturtheorie hat ihren vorläufigen Höhepunkt in HICKS’ kurzer Schrift «A Contribution to the Theory of the Trade Cycle» gefunden.

English translation: Modern business-cycle theory, building on KEYNES, has found its provisional culmination in HICKS's short work «A Contribution to the Theory of the Trade Cycle».

Haberler admires Hicks’s clarity and his use of a full-employment “ceiling,” but he doubts the empirical solidity of the model’s coefficients. The multiplier is relatively plausible, though the consumption function is less stable than Keynesians suppose. The accelerator is more problematic. In strict form it mechanically links net investment to the growth rate of income or output; in empirical work, especially on inventories, turning points do not behave as the theory predicts. Haberler therefore rejects mechanical accelerator models while preserving a weaker proposition: rising income tends, other things equal, to stimulate investment, and falling income to depress it.

His criticism is aimed not at abstraction as such, but at abstraction that forgets the institutional and temporal frictions it has assumed away.

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.

The essay’s third section addresses what Haberler calls the vulnerable point of Keynesian theory: price and wage rigidity.

Es wird heute ziemlich allgemein zugegeben, daß die Achillesferse der KEYNESSchen und aller von KEYNES inspirierten Theorien in der Annahme starrer Preise und Löhne liegt.

English translation: It is now fairly generally acknowledged that the Achilles' heel of KEYNES's theories and of all theories inspired by KEYNES lies in the assumption of rigid prices and wages.

He discusses the Pigou and Keynes effects to show that static unemployment equilibria become unstable under sufficiently flexible prices and wages. Yet he does not infer that flexibility would abolish cycles. Short-run flexibility may itself create uncertainty and depress investment. More importantly, cyclical dynamics depend not only on the general price level but also on relative-price shifts: wages versus prices, costs versus selling prices, wholesale versus retail prices, and the structure of demand across sectors.

The final conceptual move is a partial rehabilitation of older “maladjustment” theories. Aggregate demand management can offset many disturbances, but if cost increases or disproportions are concentrated in particular sectors, generalized fiscal or monetary expansion may require excessive inflation to prevent contraction there. Haberler thus criticizes Keynesian aggregation for concealing structural mismatches among industries, factor mobility, and demand composition.

Dieser fruchtbare Gedanke ist in der modernen Theorie allzusehr in Vergessenheit geraten

English translation: This fruitful idea has been all too much forgotten in modern theory.

The essay’s relevance lies in this double stance: Haberler accepts the Keynesian insight that effective demand is the proximate driver of cyclical output and employment, yet resists reducing cycle theory to large aggregates and mechanical dynamic models. A satisfactory theory must combine demand analysis with price flexibility, expectations, finance, inventories, capacity constraints, relative prices, and structural adjustment.