Emil Sax’s 1887 treatise founds Staatswirthschaft as a theoretical science of public economy and finance. Its central claim is that economic theory remains incomplete so long as it treats collective provision, taxation, and state activity as merely administrative or juridical matters. Sax wants public economy analyzed with the same conceptual rigor as private economy, while still preserving the difference between voluntary market action and compulsory collective organization.
Eine vollständige Theorie der ökonomischen Erscheinungen muss daher auch die gemeinwirthschaftlichen Phänomene in systematischer Gleichbehandlung mit den privatwirthschaftlichen umfassen.
English translation: A complete theory of economic phenomena must therefore also comprise the phenomena of the collective (public) economy in systematic parity of treatment with those of the private economy.
The book’s method is therefore both integrative and restrictive. Sax brings public economy into general economics, but he refuses to treat the state as a mystical person with its own independent psyche. Collective arrangements arise from individual needs, interests, and valuations, organized through legal and institutional mediation. Collectivism is not the abolition of egoism, mutualism, or altruism, but a higher and differently mediated form of them.
Sax’s analysis begins by reconstructing the elementary concepts of economic life. These categories are not abandoned when one turns to the state; rather, they must be reinterpreted under conditions of compulsion, common need, and collective satisfaction.
Die Elemente aller Wirthschaft, die jedem durch das ökonomische Grundverhältnis beherrschten Handeln zu Grunde liegen, sie sind: Bedürfniss, Gut, Arbeit, Werth, Capital, Kosten, Ertrag, Einkommen, Haushalt.
English translation: The elements of all economic activity, underlying every action governed by the fundamental economic relation, are these: need, good, labor, value, capital, cost, yield, income, household.
A major consequence is Sax’s disciplined account of public goods and state activity. He rejects loose formulas that classify the state itself, or “state services,” as goods in the ordinary economic sense. The state is not a consumable object and does not “work” as a private individual works. Its economic importance lies in ordering and compelling the satisfaction of needs that cannot be adequately handled by isolated private action.
The same methodological individualism governs Sax’s theory of value. Public finance may be collective in form, but value cannot begin from a fictional collective consciousness. Even the theory of public provision must begin with individual valuation and then explain how institutions transform those valuations into shared measures, burdens, and arrangements.
Da für die exacte Forschung die Psyche einer fabelhaften Collectiv-Persönlichkeit nicht existirt, so kann der Ausgangspunkt unserer Untersuchung auch wieder nur der Individualwerth sein.
English translation: Since for exact research the psyche of some fabulous collective personality does not exist, the starting point of our investigation can again only be individual value.
This position lets Sax distinguish his theory from both laissez-faire suspicion of public activity and social-political absorption of finance into welfare administration. Administration and finance can coincide in practice, but they must be separated analytically: administration concerns substantive public purposes, while finance concerns the economic means, burdens, and institutional forms through which those purposes are supported.
Taxation is consequently not a simple levy or isolated technical device. Sax treats it as an articulated system whose types and forms must be analyzed in relation to the structure of the public economy as a whole.
Die Steuer ist nur denkbar als ein Complex von Steuer-Arten, die als Glieder eines Steuersystems concipirt sind und weiterhin in Rücksicht auf die Möglichkeit verschiedengestalteter Durchführung wieder diverse Steuerformen ergeben.
English translation: The tax is conceivable only as a complex of tax kinds, which are conceived as members of a tax system and which, further, in view of the possibility of variously shaped implementation, in turn yield diverse tax forms.
The lasting significance of the treatise lies in this combination of marginal-subjective foundations, anti-metaphysical individualism, and public-finance theory. Sax makes state economy comparable to private economy without reducing it to exchange, and he makes taxation theoretically central without turning the state into a valuing person. The result is a foundational account of public economy as an exact branch of economic science.
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