Anglo-American Economists Are Living in Their Dream World and Are Ignorant of the History of Economic Thought

To one outside the magic circle of the Keynesians the reason seems to be what can be called the isolationism of Anglo-American economics. It is this isolationism that prevents economists from seeing the merits and weaknesses of their work in a detached and objective way and in the right perspective. It prevents them from being aware that most economists in Germany, France and Italy strongly oppose the Keynesian doctrines. For example, to Professor Adolf Weber, the well-known economist of the University of Munich, the idea that full employment is mainly threatened by a lag of investment behind saving, sounds merely like a bad joke. But the isolationism of Anglo-American economists is also historical. They believe earnestly that their ideas are fundamentally new, unique, and a definite answer to the problems of a competitive economy. Insufficiently educated in the history of economic thought, they do not realize that Keynesianism — down to the most technical details, like the concept of the foreign exchange multiplier — is mercantilism or, more precisely, John Lawism pure and simple. Thus they do not recognize that the objections of the classical economists to mercantilism are valid also in respect to their own teachings. Nor do they see that many concepts of the modern planners — fair prices, fair wages, fair profits, and so on — are nothing else than a new edition of the medieval scholastic concepts of justum pretium and justum salarium [just price and just salary], which proved so detrimental to economic progress.

Reading, quoting, praising and promoting each other, and only each other, will not liberate these economists from their voluntary isolationism. They will remain in their dream world. They will continue to predict the unpredictable.

—L. Albert Hahn, “Predicting the Unpredictable,” The Freeman: A Fortnightly for Individualists 3, no. 1 (October 6, 1952): 24.

Forecasting Mania Is an Integral Part of “Functional Finance,” the “Multiplier Effect” and the “Acceleration Principle”

The forecasting mania of our time is a natural concomitant of what is called Keynesian economics. It constitutes an integral part of the world of “functional' finance,” of the “multiplier effect” of the “acceleration principle” and similar concepts. If one really believes, as the “inventors” of functional finance do, that a depression can be prevented and a boom prolonged ad libitum [as much or as often as necessary or desired] by government deficit spending, if one fails to see that the elimination of the maladjustments in the price-cost relationship created during the previous boom are necessary conditions of revival, then indeed the economic future appears no longer too uncertain. And if one really believes in the working of the multiplier and the acceleration principle, then the more remote future also appears predictable. For according to the multiplier theory a given amount of spending on investment leads in time to an immediately ascertainable stable amount of spending on consumption; whereas a given amount of spending on consumption leads in time to an immediately ascertainable amount of spending on investment.

—L. Albert Hahn, “Predicting the Unpredictable,” The Freeman: A Fortnightly for Individualists 3, no. 1 (October 6, 1952): 23.

After Seeing Numerous Forecasting Failures in the 1940s and 1950s, Dr. Hahn Proposed a “Law of the Necessity of Errors in Forecasting”

All forecasts of postwar deflation turned out to be entirely wrong, as was to be expected. Almost immediately after the end of hostilities a postwar boom began. But the forecasters, in no way discouraged by their errors, stayed on the job. Now they predicted the continuation of inflation. Just when their forecasts became most articulate, in the spring of 1949, the recession of that year set in. Then deflation was considered here to stay; government intervention was advocated. The second postwar boom, not caused, I think, but accentuated by the outbreak of the Korean war in 1950, led again to predictions of continued and even of runaway inflation. But 1951 was basically a year of deflation, and of inflation only in the areas where it was governmentally fostered.

Clearly the regularity of these errors in forecasting can not be pure chance. Something like a Law of the Necessity of Errors in Forecasting must be at work.

It is seldom realized that belief in the possibility of “scientific” business forecasts, and the forecasting mania of our time, are comparatively new phenomena. Until about 1930 serious economists were not so bold — or so naive — as to pretend to be able to calculate the coming of booms and depressions in advance. It would not have fitted into their general view on the working of a free economy. They considered the economic future as basically dependent on unpredictable price-cost relationships and on the equally unpredictable psychological reactions of entrepreneurs. Predictions of future business conditions would have seemed to them mere charlatanry, just as predictions, say, regarding the resolutions of Congress two years from now.

—L. Albert Hahn, “Predicting the Unpredictable,” The Freeman: A Fortnightly for Individualists 3, no. 1 (October 6, 1952): 23.