Profits, Interest and Investment — Summary

This file is a single-author theoretical economics essay, divided into an introduction and two parts, in which Hayek revises his trade-cycle theory under more realistic assumptions: unemployment, rigid money wages, limited labour mobility, specific capital equipment, and a constant money rate of interest. Its governing claim is that crises cannot be understood by treating “investment” as a homogeneous aggregate.

The main point on which this revised version differs from my earlier treatments of the same problem is that I believe now that it is, properly speaking, a rate of profit rather than a rate of interest in the strict sense which is the dominating factor in this connection.

Part I develops the “Ricardo Effect”: when consumer-goods prices rise while money wages remain fixed, real wages fall and short-period uses of labour become more profitable than machinery or other long-period investments.

A much higher rate of profit will now be obtainable on money spent on labour than on money invested in machinery.

This reverses the usual acceleration-principle intuition. Increased consumer demand need not increase capital-goods demand; it may induce firms to work existing plant harder, employ more direct labour, and choose less durable or less labour-saving equipment. Hayek’s decisive move is to disaggregate capital. Capital-goods industries form a layered, specific structure, not a single sector.

The capital goods industries are not all equally adapted to supply the consumers’ goods industries with any kind of equipment they may need; they are further organised in a sort of vertical hierarchy.

As profits rise near consumption, demand shifts away from earlier stages producing highly durable or labour-saving equipment. Raw-material prices and other flexible costs intensify the squeeze. Thus a boom may end not because all resources are employed, but because the structure of production has become inconsistent with the available flow of consumer goods.

Our main conclusion reached so far is perhaps that the turn of affairs will be brought about in the end by a “scarcity of capital” independently of whether the money rate of interest rises or not.

Part II explains why recovery itself generates these conditions. Depression lowers profits and raises real wages, encouraging highly “capitalistic” investment. At first, unused stocks and idle plant allow incomes and employment to expand without immediate inflation. But investment guided by low profit rates yields consumer goods slowly. Hayek introduces the “Quotient,” the inverse of the acceleration multiplier, to describe this lag. If net investment creates incomes faster than consumer-goods output or saving can absorb them, consumer prices and profits rise.

The “critical point” is therefore not full employment in general, but the point at which consumer-goods supply cannot keep pace with demand. Rising profits then first stimulate investment further, making the process self-amplifying, before ultimately destroying the profitability of the more roundabout investments on which the boom depends.

It is a cumulative process, indeed an explosive process, leading further and further away from an equilibrium position till the stresses become so strong that it collapses.

Hayek’s policy conclusions are cautious but pointed. Public expenditure may be justified late in a depression to prevent consumer demand and profits from falling too far; but keeping interest rates artificially low into recovery encourages the very capital structure that later cannot be sustained. The rate of interest is not omnipotent, yet its stabilizing role is essential: it must move early enough to check profit-led misdirection.

While it appears that we can have the trade cycle without changes in the rate of interest we shall probably never have a reasonable degree of stability without such changes.

The essay’s relevance lies in its Austrian reconstruction of cycle theory after Keynes: it grants unemployment and sticky wages, but rejects aggregate demand as a sufficient guide. Hayek’s core conceptual move is structural and temporal: instability arises from mismatches between saving and net investment, real wages and profit schedules, and the time profile of capital goods and consumer-goods supply.