The archive.

Mathematical theory can describe quantitative relationships without determining their numerical values. For Schumpeter, closing that gap is the distinctive task of econometrics. In this 1933 article, he explains why prices are inherently numerical and why economists nevertheless struggle to bring theory, statistical methods, and observed facts into a single argument. His diagnosis is as much institutional as technical: theorists, statisticians, and collectors of evidence work apart, without sufficient shared training or exchange. Rather than demand a common doctrine, he proposes cooperation on concrete problems. The article offers a conception of numerical research as a discipline that can reshape theory—not simply confirm it or deliver immediate policy answers—while explicitly preserving a place for nonquantitative inquiry.

The individual problems themselves are, as it were, to teach us how they want to be handled.

Here in the English translation of Haberler's 1933 Der internationale Handel, the whole of foreign trade is folded into general price theory: exchange rates are prices formed by supply and demand, balances of payments are not autonomous magnitudes, and comparative advantage is rebuilt on opportunity cost rather than the labour theory of value. The treatise runs from the foreign-exchange market and the gold standard through the transfer problem — with extended treatment of German reparations and the Keynes-Ohlin controversy — to a systematic anatomy of commercial policy: tariffs, dumping, cartels, infant-industry claims and quotas. Throughout, protection is judged by its hidden diversion of resources and its costs to consumers and exporters, not by the visible survival of sheltered industries. Haberler reserves his sharpest hostility for quantitative restrictions, which suppress the price mechanism more arbitrarily than any duty.

It is the increase and not the reduction of duties which is the real economic burden!

Why might economists oppose reforms whose humanitarian aims they share? In this 1933 inaugural lecture at the London School of Economics, Hayek locates the tension in the difference between intentions and consequences—and in the delayed influence of economic ideas on public opinion. His account of the Historical School argues that objections to intervention were often forgotten rather than refuted. Yet his defence of theory is not an unconditional defence of laissez-faire: economists must also identify useful government action. A concrete example gives the argument its force. Whether to retain old machinery or replace it depends not simply on technical efficiency, but on the competing uses of capital and other resources. The lecture shows how Hayek connects apparently wasteful individual decisions with coordination across an economy, while separating agreement about social purposes from agreement about policy.

What Hayek defends under the name 'neutral money' is a tool of theoretical analysis, not a norm for central banks—a distinction he presses against Koopmans and Egle. The concept names an imagined case in which a money economy would leave relative prices to the 'real' determinants of barter-equilibrium theory, a counterfactual for detecting when money becomes an independent force. Its starting point is that money breaks the identity of supply and demand that barter enforces in every market: hoarding, dishoarding, newly created and destroyed money each inject demand without supply, or the reverse. From this follows the benchmark of a constant money stream. Yet sticky prices, long-term money contracts and downward wage rigidity create frictions, so practical policy may need a compromise—perhaps stabilizing an index of original-factor prices—which must not be confused with neutrality itself.

Der Begriff neutrales Geld war bestimmt, als Instrument der theoretischen Analyse zu dienen und sollte keineswegs in erster Linie eine währungspolitische Norm bilden.

English translation: “The concept of neutral money was designed to serve as an instrument of theoretical analysis and by no means was intended primarily to constitute a norm for monetary policy.”

Marxism stands or falls with its theory of value—and by that measure, this 1933 polemic sets out to demolish it. Presenting Marx largely in his own words before turning to a factual but uncompromising critique, Kerschagl reverses the Marxian causal order: labor does not create value; labor is undertaken because a purposively valued good is sought. Socially necessary labor time becomes a fiction unable to compare heterogeneous work or accommodate scarcity and demand, while the money chapter convicts Marx of a crude metallism blind to credit and purchasing power. The book's sharpest thrust is the calculation argument—by admitting only one factor of production, Marxism destroys the very measures a planned economy would need to know which processes waste labor and capital. Class struggle, he concludes, dissolves nation, law, and religion into organized antagonism.

Geldschöpfung, Angebot und Nachfrage, Marktprobleme existieren für Marx überhaupt nicht.

English translation: “Money creation, supply and demand, market problems simply do not exist for Marx.”

In this brief preface to Arthur Spiethoff’s sixtieth-birthday Festschrift, Schumpeter distinguishes an economist’s international reputation from the wider methodological achievement it can obscure. Spiethoff, he argues, offers more than contributions to business-cycle research: his particular investigations show how historical understanding and analytical skill can work together, without first resolving their relationship in a methodological programme. Schumpeter brings the same preference for substantive inquiry to his account of the collection, welcoming younger economists, outsiders to cycle research, and studies of individual problems alongside general assessments. The preface offers a compact statement of what he values in economic scholarship: methods demonstrated through results, and intellectual breadth that does not require a common theory.

How can economists learn modern statistical methods when their mathematical preparation falls short? In this 1933 review of Wilhelm Winkler’s Grundriß der Statistik, I. Theoretische Statistik, Joseph A. Schumpeter assesses the compromises an intermediate textbook must make. He values worked examples as a means of independent study where university teaching is inadequate, but does not confuse accessibility with full understanding. His sharpest pedagogical objection concerns the placement of abstract foundations: what comes first logically may become intelligible only after practical work. The review offers a concrete view of Schumpeter’s standards for economic training—statistics alongside theory and economic history—and of his distinction between methods every economist should command and foundational controversies that an introductory course need not resolve.

Defending entrepreneurial initiative need not mean defending the power of capital. In this 1933 study, Eugen Peter Schwiedland distinguishes the creative organizer of production from the financier who controls enterprises through credit and other people’s assets. He judges business success by useful provision and collective welfare, not private earnings alone, while questioning whether bureaucratic management can preserve entrepreneurial judgment and adaptability. The sharpest tension lies in his proposed remedy: criticism of financial domination leads him toward stronger state authority and a sympathetic account of Italian fascist corporatism. Readers can examine how a defense of personal economic responsibility becomes joined to an authoritarian program of coordination—and where Schwiedland places the boundary between productive leadership and irresponsible power.

How much qualification can popular economics afford—and how much can it afford to omit? In this short review of Barrett Whale’s International Trade, Gottfried Haberler makes precision, rather than simplicity alone, the test of successful exposition. He singles out Whale’s treatment of purchasing power parity for preserving a useful insight without disguising its limits, contrasting it with Cassel’s popular writings. The same standard informs his approval of Whale’s qualified free-trade position: protection may sometimes confer economic benefits, yet identifying and administering those exceptions presents formidable difficulties. The review offers a compact view of Haberler’s judgement about the relationship between theoretical exceptions, practical policy, and writing for the general reader.

Commodity markets can reach equilibrium while workers remain unemployed: this distinction anchors Emil Lederer’s review of John Maurice Clark’s Strategic Factors in Business Cycles. Lederer values Clark’s account of why automatic market adjustment may fail to restore employment, and reads it as a case for intervention extending beyond central-bank interest-rate control. His assessment connects unstable investment and consumer income to the danger of severe depressions, while questioning the book’s omission of technical progress. This compact review offers a precise encounter with Lederer’s criteria for economic explanation: data require theoretical interpretation, and market balance must not be mistaken for social recovery.

Can credit-financed investment generate the savings needed to sustain itself? In this 1934 review of Alfred Müller-Armack’s Entwicklungsgesetze des Kapitalismus, Fritz Machlup makes that monetary question a test of a broader philosophy of historical development. He grants that later saving can validate investments initially financed by new credit, but disputes the claim that this outcome follows reliably from expansion itself. His criticism separates a possible sequence of events from a necessary economic mechanism. Yet he does not dismiss the book: he values Müller-Armack’s challenges to deterministic accounts of capitalism even while questioning their theoretical foundations. The review offers a compact encounter with Machlup’s critical method—testing ambitious historical explanations against their economic premises without assuming that a faulty foundation invalidates every conclusion.

Can a rigorous science of human action accommodate interpretive sociology? In this 1934 review of Ludwig Mises’s Grundprobleme der Nationalökonomie, Alfred Schütz endorses the demand for theoretical foundations while resisting Mises’s treatment of Max Weber. He explains how Mises derives economic categories from the structure of action and assigns experience the task of determining when theoretical propositions apply. But he refuses the implication that Weber’s attention to meaning makes sociology less theoretical. The review offers a compact encounter between two demands that Schütz will not allow to become simple opposites: conceptual rigour and interpretation. Its interest lies in the precision of his qualified agreement, including his recognition that theory is indispensable to history without replacing inquiry into particular events.