Friedrich August von Hayek · 1939
The file is a single theoretical lecture-essay. Its scope is Hayek’s restatement of trade-cycle theory through equilibrium, expectations, money, and capital. The central thesis is that crises cannot be explained by “overproduction” or mass irrationality alone: monetary disturbances falsify the signals conveyed by prices and interest rates, causing entrepreneurs to make investment plans incompatible with consumers’ intertemporal preferences.
Hayek opens methodologically. The task is not to abandon equilibrium theory for a separate “dynamic” economics, but to revise general theory so that it can handle time, foresight, and adjustment.
What we all seek is therefore not a jump into something entirely new and different but a development of our fundamental theoretical apparatus which will enable us to explain dynamic phenomena.
The essay’s first conceptual move is to redefine equilibrium as a relation among plans and expectations rather than as a timeless set of magnitudes. Traditional equilibrium theory fails because it abstracts from time and assumes away the problem it must explain.
The main difficulty of the traditional approach is its complete abstraction from time.
For Hayek, equilibrium in a competitive society means that the expectations on which different agents act are mutually compatible. Disequilibrium appears when prices induce plans that cannot all be fulfilled. This is why the theory of crises must focus on the informational role of prices and especially of the interest rate.
A condition of equilibrium would require that the intentions of the two groups are at least compatible.
The next step is Hayek’s theory of entrepreneurial error. Crises require mistakes, but not merely accidental mistakes. What must be explained is why many entrepreneurs err in the same direction at once. His answer is that they are misled by monetary signals that normally would be reliable. A low rate of interest generated by credit expansion appears to indicate a greater supply of saved resources than actually exists.
Every explanation of economic crises must include the assumption that entrepreneurs have committed errors.
This leads to the essay’s core Wicksell-Mises argument. “Money capital” supplied through credit is not the same as real saving. If credit expansion lowers the market rate below the equilibrium rate, entrepreneurs lengthen production and shift resources toward more remote capital goods, as if consumers had decided to defer consumption. But consumers have not made that decision.
An equilibrium rate of interest would then be one which assured correspondence between the intentions of the consumers and the intentions of the entrepreneurs.
The resulting boom is therefore not harmonious growth but a concealed inconsistency. New money incomes eventually raise demand for consumers’ goods; unless credit continues expanding at an accelerating pace, the scarcity of resources needed to complete the new investment structure becomes visible.
In such a situation there exists evidently a conflict between the intentions of the consumers and the intentions of entrepreneurs which earlier or later must manifest itself and frustrate the expectations of at least one of these two groups.
Hayek’s paradoxical account of the crisis follows: the bust is not caused by a simple excess of capital goods, but by a shortage of “free capital” relative to the investment plans already begun. Equipment may stand idle precisely because the complementary future investments required to use it profitably are no longer forthcoming.
This phenomenon of a scarcity of capital making it impossible to use the existing capital equipment appears to me the central point of the true explanation of crises; and at the same time it is no doubt the one that rouses most objections and appears most improbable to the lay mind.
The later sections refine the capital-theoretic language behind this argument. Hayek criticizes vague appeals to saving, investment, and maintenance of capital as if they were unambiguous measurable aggregates. He wants the theory stated instead in terms of two sets of plans: consumers’ intended distribution of resources between present and future consumption, and entrepreneurs’ planned provision of consumers’ goods at different dates. Crisis arises when monetary disturbance makes these plans diverge.
The essay’s relevance lies in this shift from mechanical cycle theory to an expectations-based account of coordination failure. Hayek preserves the Austrian theory of malinvestment while making it depend less on crude aggregate capital concepts and more on the compatibility of plans over time. Its concluding gesture is explicitly programmatic: the theory of fluctuations must study not only reactions to price changes, but the formation of expectations themselves.
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