Ludwig von Mises, Lord Keynes and Say’s Law

Ludwig von Mises’s article, originally published in 1950 and reprinted in the supplied 1952 version, defends Say’s Law against Keynes and interprets Keynesianism’s success as the political rehabilitation of inflationism. Its four sections move from an explanation of Say’s argument to a history of monetary controversy, an indictment of Keynes’s theoretical claims, and a warning about capital consumption. Mises’s central contention is that Keynes neither refuted Say nor answered the monetary theory of the business cycle. Instead, he supplied intellectual authority for expansionary policies that governments already wished to pursue.

The first section presents Say’s Law as a preliminary clearing away of misconceptions rather than a complete economic theory. Merchants traditionally attributed bad business to insufficient money or general overproduction. Mises credits Smith with attacking the first explanation and Say with systematically refuting the second. His conceptual starting point is the distinction between absolute abundance and production that is excessive only relative to consumer demand:

With regard to economic goods there can be only relative overproduction.

An economic good remains scarce in relation to unsatisfied wants; otherwise, in Mises’s terminology, it would be a free good. Excess production therefore means a mistaken allocation among goods, not an abundance of everything people desire. His example contrasts too many shoes with too few shirts: the imbalance changes their exchange ratio and disadvantages shoemakers while benefiting shirtmakers. He argues that this cannot explain a depression affecting business generally.

Money enters this account as an intermediary: commodities ultimately purchase other commodities. Increased production elsewhere consequently enlarges the opportunities available to a producer, whereas producing the wrong goods exposes that producer to losses. The distinction shifts the explanation of commercial difficulty from an alleged inability to sell production in general to entrepreneurial failures of anticipation:

It would be more appropriate to declare that the first and main problem of business is to produce in the best and cheapest way those commodities which will satisfy the most urgent of the not yet satisfied needs of the public.

Profit and loss thus coordinate production with consumers’ priorities. Successful entrepreneurs expand, while persistent mistakes bring contraction or exit. Mises nevertheless explicitly limits what Smith and Say accomplished: refuting scarcity-of-money and general-overproduction explanations did not itself provide an adequate theory of recurrent depressions. He assigns the first subsequent explanation to the British Currency School. This qualification matters because his defense of Say does not treat Say’s Law alone as a complete account of the business cycle.

The second section connects that preliminary argument with the later monetary or circulation-credit theory. Mises depicts nineteenth-century acceptance of Say’s Law as a boundary separating economists from advocates of inflation. Subsequent economics, he maintains, explained why credit expansion initially stimulates business but ultimately produces a downturn:

Thus it conclusively proved that the slump, whose appearance the inflationists attributed to an insufficiency of the supply of money, is on the contrary the necessary outcome of attempts to remove such an alleged scarcity of money through credit expansion.

The conceptual reversal is central: the proposed remedy becomes the cause of the condition it promises to cure. Mises does not deny the initial boom; he disputes its durability. His political explanation then turns on differing time horizons. An economist’s warning concerns enduring welfare, whereas an electorally motivated politician may value immediate expansion despite its later consequences. In this account, the appeal of deficit finance and credit creation rests partly on the separation between present political rewards and deferred economic costs.

Keynes’s historical role follows from this political diagnosis. Unlike economists whose recommendations challenged established policies, Mises argues, Keynes defended practices already adopted before the General Theory appeared:

His achievement was a rationalization of the policies already practiced.

Mises consequently explains the book’s rapid reception through its usefulness to governments and their economic advisers. Keynesian doctrine relieved officials of the intellectual embarrassment of administering policies condemned by the economics Mises regarded as sound. The article’s account of influence is therefore also an account of legitimation: theoretical prestige makes existing political commitments appear economically warranted.

The third section returns to the alleged refutation of Say. Mises charges Keynes with rejecting the law without answering its rationale and with ignoring objections to inflationism rather than overcoming them. He associates monetary expansion with redistribution, capital malinvestment, and capital decumulation, and maintains that Keynes supplied no adequate rebuttal. Mathematical expression and claims of novelty, he argues, do not establish the truth of an older inflationist doctrine. His criticism of Keynes’s disciples similarly targets dismissive labels and appeals to intellectual fashion as substitutes for reasoning. These are forceful allegations, but the article does not closely reconstruct Keynes’s arguments; its argumentative weight falls on Mises’s exposition of Say and his assertion that the relevant monetary objections remain unanswered.

The brief fourth section draws the theoretical and political strands together. Deficit spending, Mises concludes, cannot escape economic constraints through rhetorical brilliance or official approval. His closing image contrasts the promise of creating abundance with the consumption of seed corn: apparent prosperity can represent the depletion of resources needed for future production. The article’s enduring relevance lies in this connection between monetary theory, capital preservation, and political incentives. It presents the Keynesian controversy as a dispute not merely about managing expenditure, but about whether policy creates sustainable wealth or conceals its consumption.