Wilhelm Röpke on Hayek’s Geldtheorie und Konjunkturtheorie (1929)

Wilhelm Röpke’s journal book review presents Hayek’s study as a major intervention in a business-cycle debate threatened by intellectual exhaustion. Initial confidence in settled results had given way to skepticism and conflicting opinions, especially over monetary causation. Hayek’s achievement, for Röpke, is to reopen this problem with sufficient conceptual clarity to make apparently irreconcilable positions potentially compatible. His praise nevertheless remains discriminating: the book is an important, partly programmatic beginning, whose central propositions deserve both endorsement and qualification. The review follows its chapter sequence, moving from the relation between theory and statistical inquiry through competing explanations of fluctuations to credit creation and the tasks of future research.

Röpke first endorses Hayek’s methodological priority of theory over empirical-statistical business-cycle research. That judgment has particular significance because Hayek directs an institute substantially devoted to statistical work:

Daß der Primat der Konjunkturtheorie zuerkannt wird, erscheint als die einzig mögliche Antwort auf jene Frage, aber leider ist diese Unbefangenheit des Urteils nicht allen Leitern von Konjunkturinstituten eigen; um so mehr ist sie bei Hayek zu loben.

English translation: That primacy is accorded to business-cycle theory appears to be the only possible answer to that question, but unfortunately not all directors of business-cycle institutes possess this impartiality of judgment; all the more reason to praise it in Hayek.

The substantive counterpart of this methodological position is an expanded conception of monetary causation. Monetary business-cycle theory, as Röpke presents Hayek’s argument, has mistakenly identified its distinctive explanatory element with fluctuations in the general price level. This focus neglects money’s deeper effects and the difference between a monetary economy and the pure nonmonetary economy underlying static theory. Escaping that restriction allows monetary analysis to approach the concerns of nonmonetary theorists without surrendering its own explanatory claim. Röpke thus identifies a double ambition: Hayek seeks both to narrow the distance between rival schools and to establish the enlarged monetary theory as the only possible, or at least the only satisfactory, account.

The discussion of nonmonetary theories turns on their inability to explain how an economy departs from static equilibrium despite the market’s automatic mechanisms of adjustment. Röpke broadly accepts this criticism but resists treating it as conclusive. Changes in the rate of accumulation in real terms could themselves disrupt equilibrium, a possibility Hayek acknowledges later but does not incorporate into the initial argument. Röpke makes his own theoretical allegiance explicit while insisting on this opening:

Die Vertreter der monetären Theorie könnten und sollten ohne Gefahr für die allgemeine Schlüssigkeit ihrer Theorie ruhig zugeben, daß sie an dieser Stelle nicht ganz wasserdicht ist, wie ja auch der Rezensent, der sich ganz als monetärer Konjunkturtheoretiker im erweiterten Hayekschen Sinne fühlt, seinen eigenen Erklärungsversuch von dieser Seite der Ueberakkumulation her aufgezäumt hat.

English translation: The representatives of monetary theory could and should readily admit, without jeopardizing the overall cogency of their theory, that it is not entirely watertight at this point, just as the reviewer, who regards himself wholly as a monetary business-cycle theorist in Hayek’s expanded sense, has approached his own explanatory attempt from this side of overaccumulation.

This qualification is important because it makes Röpke’s agreement an argument within monetary theory, rather than an unreserved acceptance of its exclusivity. He adds a more concrete objection: automatic market adjustment does not always operate, notably in agriculture, where he finds Hayek’s account untenable. Neither objection overturns his favorable judgment. Both limit the reach of the equilibrium argument while preserving the usefulness of the broader monetary approach. His approval is stronger for the subsequent chapter’s detailed criticism of the older monetary theory.

Röpke identifies the account of cyclical credit creation as the book’s most important section. The question is not simply why money and credit quantities change, but why those changes recur cyclically—or, equivalently in this account, why the money rate of interest deviates cyclically from the equilibrium rate. Hayek’s endogenous explanation gives the primary role in additional credit creation to commercial banks rather than banks of issue. Their behavior follows from an elastic credit organization inseparable from the existing economic order, rather than from an independently imposed disturbance:

Elastizität des Kreditsystems und Zyklizität der Kreditmengenänderungen und damit (nach der monetären Konjunkturtheorie) auch Zyklizität der Konjunkturschwankungen sind also »dreieinig, nicht zu trennen«, — ein Satz, dem eine sehr verdienstvolle Analyse des Kreditschöpfungsprozesses zur Grundlage dient.

English translation: The elasticity of the credit system and the cyclicality of changes in the quantity of credit, and thus (according to monetary business-cycle theory) also the cyclicality of business fluctuations, are therefore “three-in-one, inseparable”—a proposition grounded in a highly meritorious analysis of the process of credit creation.

Röpke praises the analysis without claiming to have reached a final judgment on this necessary connection. His remaining reservations may be less divisive than they appear, since Hayek concedes scope for policies that moderate variations in credit and consequently economic fluctuations. The review therefore distinguishes an endogenous tendency toward cycles from the impossibility of mitigating them. It closes by endorsing Hayek’s research agenda, especially the refinement of interest theory into a theory of the effects of interest. Its significance lies in this combination of theoretical realignment and critical restraint: Röpke supports moving monetary explanation beyond aggregate prices, while retaining questions about real accumulation, sectoral adjustment, and how tightly credit elasticity binds the economy to cyclical instability.