Frank Albert Fetter, Comment on Rent under Increasing Returns

Frank Albert Fetter’s journal comment, originally published in 1930 and reprinted in the supplied 1977 edition, examines Albert Benedict Wolfe’s attempt to loosen the connection between agricultural rent and diminishing returns. Fetter welcomes renewed interest in economic theory but argues that Wolfe’s revision rests on contradictory assumptions about free land, input costs, and static equilibrium. His criticism proceeds in two stages: a reconstruction of the marginal valuation implicit in Ricardian rent theory, followed by an examination of the different meanings concealed within “increasing returns.” The conclusion distinguishes his defense of consistency in the older doctrine from his own broader conception of rent.

The opening places the controversy within an international revival of logical economic analysis. Fetter interprets German calls for renewed classical methods as evidence of the influence of Austrian psychological economics, rather than a demand to restore every detail of Ricardian doctrine. Wolfe’s article offers an occasion to clarify the older theory, but its qualified claims about rent under increasing returns require scrutiny:

Let us consider the treatment in the article: first, of cost on the marginal no-rent land, and secondly, of the concept of increasing returns. The one question relates to the interpretation of the most valid feature of the Ricardian doctrine, the other to certain points of more modern theory.

The first objection concerns the valuation of inputs on land assumed to remain free. Fetter treats Ricardian rent as a residual valuation of complementary productive agents: the remuneration of nonland inputs is established where no surplus remains attributable to land, and the surplus on better land measures rent. Wolfe instead combines the assumption that inferior land remains rent-free with numerical examples in which it produces a substantial surplus above input costs.

In the classical rent doctrine, cost (which Professor Wolfe not inaptly prefers to call input) is always held to equal, or to absorb, the whole product on the no-rent land.

This is a condition of equilibrium, not merely a terminological convention. In Wolfe’s example, five doses of input on free land produce fifty units while allegedly costing only twenty-five. Fetter argues that, if the land genuinely remains free, the inputs must absorb the entire fifty-unit product: each dose therefore has a value of ten units. Comparable inputs employed on superior land must carry the same valuation, including as opportunity costs. The exception would be a product that was itself a free good, which would eliminate rent on the better land too.

Fetter also restores the distinction between extensive and intensive margins. Rent need not be measured against a separate tract of rent-free land; an additional application of input that yields no surplus above its cost provides an equally effective margin. Wolfe momentarily recognizes this principle, then stops cultivation while further applications would still increase net returns. His allocation between better and free land consequently fails the marginal test on both. Correcting the assumed input valuation reduces one calculated rent from fifty-seven units to thirty-four. Moreover, Wolfe understates the alternative return on free land by concentrating all inputs on one piece when spreading them over additional free land would yield more.

The second objection distinguishes economy-wide change from adjustment within an individual enterprise. Historically, increasing returns concerns changes in productive arts, population pressure, and the economy over time. Wolfe instead uses it for a cultivator’s selection among combinations of inputs under supposedly static conditions. For Fetter, this confuses the explanation of general rent levels with the narrower problem of maximizing individual profit.

The question which the individual cultivator has to decide is not whether another dose of input will give a gross result greater or less than did a preceding dose, but whether it will increase the gross result by more than the amount (or value) of the added dose of input. If it thus gives any net gain, it is economically justified.

The operative comparison is additional product against additional cost, not simply one gross increment against another. Fetter argues that comparisons of average returns can already express the economically relevant incremental information. Wolfe’s elaborate comparisons therefore fail to identify the actual stopping condition.

The deeper difficulty is treating alternative production arrangements as simultaneously available after a competitive equilibrium has formed. Technological change may establish a new economical proportion of inputs and a corresponding rent level; it does not leave every earlier combination as an equally viable choice. Inputs used jointly contribute to a combined product, rather than retaining the separate returns attributed to them in hypothetical successive applications. Rent itself enters the cultivator’s costs, whether as a contractual payment or an alternative valuation. Using fewer inputs than competitive practice requires may therefore bring losses rather than offer a sustainable lower-return equilibrium.

In sum, the static increasing returns, the effects of which upon rent it is the purpose of the article to elucidate, have no existence excepting in the whimsical sense of the correction by an enterpriser of successive costly blunders.

The closing qualification gives the comment its broader significance. Fetter has provisionally followed Wolfe’s agricultural definition of rent, but regards that restriction as outdated. Optimal proportions of complementary inputs apply to productive agents generally, and the useful element of rent theory extends to the durable, separable uses of goods beyond land. His intervention thus preserves marginal and residual reasoning while rejecting their confinement to agriculture: a consistent reconstruction of Ricardian analysis becomes a bridge toward a generalized theory of productive valuation.