Friedrich August von Hayek, Maintaining Capital Intact: A Reply (1941)

Hayek’s journal reply examines whether “maintaining capital intact” can provide an objective basis for distinguishing net income from the consumption of capital. Addressing Professor Pigou, it proceeds in two parts: a criticism of Pigou’s proposed definition, followed by an argument against assuming that familiar accounting language must possess a unique, theoretically defensible meaning. Hayek’s central claim is that capital maintenance cannot be determined by keeping any measurable quantity of capital constant. Its practical purpose concerns the preservation of future earning capacity, which depends on expectations and changing knowledge rather than physical inventories alone.

Pigou’s proposal, as Hayek presents it, treats capital as maintained when losses from physical wear and tear have been replaced, leaving obsolescence out of account. Hayek objects that this exclusion would have to encompass predictable as well as unpredictable obsolescence. His counterexample compares three entrepreneurs investing equal sums in machines with the same potential physical life of ten years. One expects continuous use; another knows that changing fashion will make his machine virtually worthless after one year; the third faces roughly equal chances of continued operation or almost immediate scrapping. Equal allowances for physical deterioration would classify equal gross receipts as yielding equal net incomes, although the entrepreneurs face radically different prospects of preserving their investment.

The example exposes the difference between the survival of equipment and the survival of its economic usefulness. An entrepreneur who knowingly treats receipts needed to replace an obsolescing machine as disposable income effectively plans to consume his capital. Hayek extends the objection to taxation: taxing replacement allowances as income would impose something resembling a special capital-turnover tax on industries with rapid obsolescence. Wireless manufacture illustrates how technological improvement could make equipment economically short-lived despite its physical durability. Such taxation would discourage investment precisely in innovative and experimental industries.

The analytical objection follows the same logic. A definition of net income should help identify the long-run costs that must be covered for investment to remain profitable:

It is immediately clear that all foreseeable obsolescence (whether it can be predicted with certainty or only with a certain degree of probability) must here be taken into account.

Probability therefore matters alongside certainty. The risky undertaking cannot be evaluated adequately through the machine’s physical depreciation alone. Hayek makes expectations integral to capital accounting rather than treating them as complications that can be excluded from an otherwise objective calculation.

Yet admitting obsolescence does not justify requiring compensation for every capital loss. Hayek agrees with Pigou that replacing losses caused by unforeseen and unforeseeable changes may constitute new saving rather than maintenance. Otherwise, individuals or whole communities could be declared to have no net income for years, even while remaining able to sustain or increase consumption. The crucial distinction is between provision for anticipated losses and retrospective restoration after unexpected losses. Capital maintenance is primarily a problem of planning:

The question is, what allowance for amortisation he ought to make in his calculations so that, in view of all the circumstances known to him, he can expect to be able to earn the same income in the future.

This formulation relocates the issue from an externally observable stock to the entrepreneur’s information and prospective income. As knowledge changes, the appropriate provision changes too. An observer cannot judge the adequacy of maintenance merely by comparing quantities of capital at successive dates. Even full knowledge of the entrepreneur’s information would not imply that the best decisions preserve a constant measured stock.

In a changing world, where different people, and even the same people at different times, will possess different knowledge, there can be no objective standards by which we can measure whether a person has done as well in this effort as he might have done.

Hayek consequently challenges the theoretical picture of capital as an enduring entity that maintains its quantity while moving between profitable forms. Owners may conscientiously try to avoid involuntary consumption of capital without collectively or individually preserving any constant capital magnitude. He nevertheless explicitly retains the concept of net income: what he rejects is its definition through changes in the “quantity” of capital. He refers readers to The Pure Theory of Capital for the alternative procedure rather than developing it fully in this reply.

The second part addresses Pigou’s methodological defence: because businesspeople and legislators use the expression, economists should continue searching for its precise meaning. Hayek accepts the importance of understanding and improving accounting practices but distinguishes their practical purpose from their customary formulation:

The fact that practical men try to apply to all cases a formula which has served them well in a great many cases does not prove that in these attempts the formula must necessarily have any meaning at all.

Keeping the money value of capital constant may ordinarily approximate the purpose of capital accounting, but it cannot achieve that purpose under every circumstance. The economist’s task is therefore to identify the limits of the convention and help accountants and tax authorities find practices suited to exceptional cases. The reply’s significance lies in this conjunction of accounting criticism and an argument about knowledge: useful rules need not express invariant economic quantities, and exposing their limitations can be a constructive theoretical result.