Amonn’s Grundzüge is a systematic treatise in pure theoretical economics. It brackets history, policy, and description in order to ask what theoretical Nationalökonomie can explain as theory. Its answer is deliberately narrow: economics is centered on value, price, and distribution, understood as the determination of regular exchange relations among goods. Subjective valuation matters, but only as a condition for explaining objective market ratios, not as an autonomous psychology of welfare.
Der Preis keines Gutes ist unabhängig von denen der anderen bestimmt, sondern alle sind zugleich, «simultan» bestimmt.
English translation: The price of no good is determined independently of the others; rather, all are determined at once, "simultaneously."
This sentence gives the book its organizing principle. Amonn rejects isolated price stories: one commodity’s price depends on alternatives, incomes, costs, and factor payments, while these depend again on product prices and purchasing power. Price theory is therefore theory of a system. The market is not merely a meeting of one supply and one demand; it is the whole nexus in which goods, productive services, and incomes are mutually fixed. In this respect Amonn approaches general-equilibrium reasoning, though his vocabulary remains that of value theory, marginal utility, cost, and distribution.
The same demand for systematic explanation governs production and distributive shares. Wages, rent, and interest are prices of productive services, not independent ethical or historical categories. Yet Amonn does not turn this into a simple marginal-productivity doctrine. Marginal productivity describes an important relation inside the system, but it cannot be the ultimate ground of factor value, because the value of a factor’s product already presupposes the prices the theory must explain.
Die Erklärung des Wertes der Produktionsfaktoren aus deren Grenzproduktivität – die sogenannte «Grenzproduktivitätstheorie» – bewegt sich daher in einem Zirkel und kann nicht als eine befriedigende Erklärung betrachtet werden.
English translation: The explanation of the value of the factors of production from their marginal productivity—the so-called "marginal productivity theory"—therefore moves in a circle and cannot be regarded as a satisfactory explanation.
The criticism is methodological rather than anti-productivity. Amonn does not deny that productive contribution affects demand for labor, land, or capital services; he denies that it can escape circularity when treated as a unilateral cause. Distribution theory must therefore be integrated into price theory, not appended as a separate doctrine of natural shares.
His treatment of capital and interest extends the same point. The superior yield of roundabout production may strengthen demand for capital use, but it does not by itself define interest or give a complete explanation of it.
Die Mehrergiebigkeit zeitraubender Produktionsumwege ist lediglich ein die Nachfrage nach Kapitalnutzung vergrößernder und verstärkender Umstand, wenn auch ein sehr wichtiger, für die Tatsächlichkeit des Zinses sogar entscheidender.
English translation: The greater productivity of time-consuming roundabout methods of production is merely a circumstance that enlarges and reinforces the demand for the use of capital—an important one, to be sure, and indeed decisive for the actual existence of interest.
Interest is instead a price phenomenon: the price paid for the use of capital, formally comparable to rent for land use and wages for labor services. The differences among these factors remain, but all must be explained through the simultaneous determination of the price system.
The appendix on Stackelberg clarifies Amonn’s standard for contemporary theory. He values analysis of market forms, but judges it incomplete when it remains partial and does not exhibit the unified determination of prices.
Es fehlt die Darlegung der einheitlichen, «simultanen» Bestimmtheit aller Preise, des «Preissystems».
English translation: What is lacking is the exposition of the unified, "simultaneous" determination of all prices, of the "price system."
The lasting significance of Grundzüge lies in this insistence on interdependence. Amonn combines marginalist themes—utility, scarcity, substitution, and productivity—with a critique of every explanation that makes one element foundational in isolation. Neither value, nor cost, nor marginal product, nor capital productivity suffices alone. The object of theory is the price system as a simultaneous order, and every local explanation must be tested by whether it can be integrated into that whole.
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