Friedrich von Wieser, Über die Messung der Veränderungen des Geldwertes

Wieser’s published oral conference presentation, reproduced in the 1929 edition, examines how changes in the value of money can be measured without confusing them with changes in production, consumption, or income. Delivered within a discussion of national economic productivity, the lecture deliberately treats monetary measurement as a problem requiring its own conceptual foundations. Its structure moves from a critique of metallism through the limitations of ordinary price indices to a proposal grounded in household budgets, before concluding with a methodological argument about the relationship between individual economies and the national economy.

For Wieser, developed monetary systems derive money’s value from its exchange function, not independently from its metallic substance. Monetary value is therefore a composite reflection of the goods exchanged through money. Individuals experience this composite as a continuous scale governing their expenditure; socially, inherited prices provide the framework within which new prices are formed. This apparent unity must not be mistaken for an intrinsic property of the monetary material:

Indem das Geld die Reflexe aller von ihm im Tausche bewegten Warenwerte in seinem Werte zu einer Gesamtwirkung vereinigt, entsteht der täuschende Eindruck, daß sein Wert eine einheitliche, eine einfache Erscheinung sei, und damit der weitere täuschende Eindruck, daß er eine ursprüngliche, im Geldstoffe ruhende Größe sei.

English translation: By uniting the reflections of all the commodity values that it moves in exchange into an aggregate effect within its own value, money creates the deceptive impression that its value is a unified, simple phenomenon, and thereby the further deceptive impression that it is an original magnitude residing in the monetary material.

General price indices implicitly acknowledge this composite character, even though economists working within metallist assumptions developed them. A single commodity cannot disclose the movement of monetary value; a representative aggregate is necessary. Yet aggregating prices alone remains insufficient. Wieser recalls the falling indices after 1873: bimetallists attributed them to gold appreciation following silver’s demonetization, while their opponents invoked intensified competition and reduced production costs. The price record alone could not settle the interpretation.

Wieser does not simply replace this ambiguity with a distinction between causes originating in money and causes originating in goods. Instead, he begins with nominal and real wages. A changed nominal wage expressing an unchanged real wage indicates a changed monetary measure; parallel movements of nominal and real wages do not. An individual’s promotion similarly changes the personal significance of a monetary unit without necessarily changing the monetary scale generally. Extending this reasoning to incomes across the economy gives his decisive criterion:

Nur wenn das gleiche Realeinkommen sich mit anderem Geldeinkommen ausdrückt, dann ist die Skala des Geldwertes, dann ist der spezifische Geldwert als solcher ein anderer geworden.

English translation: Only when the same real income is expressed by a different money income has the scale of monetary value, and thus the specific value of money as such, become different.

The proposed measurement starts from ordinary economic experience: people judge what their incomes mean by the consumption available at prevailing prices. Household statistics would establish representative income types and record both their real expenditures and their monetary costs in a base year. Subsequent observations would determine the money sums required to represent the same real contents. Seasonal fluctuations require averaging, while disappearing and newly introduced forms of consumption require adjustments. For long periods, Wieser adopts Marshall’s suggestion of comparisons between successive transitional forms rather than imposing a single unchanged standard across centuries. Comparisons between societies with fundamentally different ways of life remain much harder.

Representation must also follow social and geographical differentiation. Different classes purchase different categories of goods, whose prices need not move together. Town and country, cities of different sizes, industrial districts, and agricultural regions may exhibit distinct monetary conditions. Wieser therefore calls for locally appropriate class types, population weighting, and attention to statistical dispersion. An aggregate should emerge from these differences, not erase them at the outset.

The resulting measure would permit monetary income figures to be corrected so that movements in real income could be assessed. Where comprehensive income statistics were unavailable, a sufficiently broad network of household types could still support a judgment extending beyond individual classes. Its distinguishing feature would be its integration of retail prices, consumption goods, and complete household expenditure:

Die Preisindexzahl wäre zugleich Einkommenindexzahl und daher würde die Methode, weil sie die beiden Tatsachen des Preisstandes und des persönlichen Einkommens im Zusammenhange faßt, ein brauchbareres Ergebnis liefern können als die gebräuchlichen Systeme der bloßen Preisindexzahlen.

English translation: The price index would simultaneously be an income index, and therefore the method, because it grasps the two facts of the price level and personal income in their connection, could yield a more useful result than the customary systems of mere price indices.

Wieser acknowledges the greater complexity of this procedure but turns that difficulty into a criticism of theoretical simplification. The national economy is a connection among many individual economies, not a self-explanatory unified agent. A common market price has different meanings for people with different circumstances, and these differences motivate supply and demand:

Ueber dieses persönliche Ende der Preisbeurteilung darf die Theorie nicht hinweggleiten, denn es ist das lebendige Ende.

English translation: Theory must not glide over this personal endpoint of price assessment, for it is the living endpoint.

The lecture’s relevance consequently extends beyond index construction. Its measurement proposal expresses a broader demand: monetary aggregates must be understood through the differentiated economic lives that generate them. Wieser offers a conceptual and statistical programme rather than a worked numerical demonstration, insisting that explanatory adequacy takes precedence over an attractively simple formula.