Karl Schlesinger’s 1914 monograph develops a mathematical theory of money and credit within general equilibrium. Organized into chapters on barter, credit and entrepreneurial profit, money, deposit banking, and international monetary relations, it treats monetary institutions not as external additions to “real” theory but as endogenous parts of a system of mutually determined prices, quantities, interest rates, cash balances, and bank reserves.
Die übrigen wirtschaftlichen Tatsachen sind nicht nur der Einwirkung der Daten unterworfen, sondern beeinflussen sich zum Teil direkt, zum Teil durch die Vermittelung vieler Zwischenglieder wechselseitig, stehen daher als „interdependente Größen“ in einem funktionellen Zusammenhang miteinander.
English translation: The remaining economic facts are not only subject to the influence of the data, but also affect one another reciprocally—partly directly, partly through the mediation of many intermediate links—and therefore stand in a functional relationship with each other as "interdependent magnitudes."
Chapter I constructs the nonmonetary benchmark. Schlesinger begins with marginal utility, production functions, marginal productivity, capitalization, saving, and interest, but his aim is not partial explanation. Prices of consumption goods, factor services, capital goods, rents, production volumes, and saving decisions are jointly fixed in a simultaneous equation system. Interest emerges from the interaction of productive capital, time valuation, and abstinence; even the “static” model therefore points toward development, since saving and capital formation alter future conditions.
Der Nutzen, den die dem Grenzbedürfnis dienende Gütermenge stiftet, ist deren Grenznutzen.
English translation: The utility yielded by the quantity of goods that serves the marginal need is its marginal utility.
Chapter II introduces uncertainty and credit. Once future returns are only estimated, entrepreneurial profit becomes a distinct income category, arising from the assumption of risk and from deviations between expected and realized yields. Credit is not merely a transfer of existing goods: it connects durable productive assets, expectations, and the entrepreneur’s capacity to command resources before final returns are known. Schlesinger’s theory thus links Austrian capital theory with a Schumpeterian concern for economic change.
The money chapter derives money from the practical failure of frictionless barter. In a purely formal barter model, indirect exchange could be costless and perfectly coordinated; in actual economies, search costs, timing differences, and uncertainty require a generally accepted medium.
Eine wesentliche Folge dessen, daß die Wirklichkeit mit dieser Voraussetzung nicht übereinstimmt, ist das Geld.
English translation: An essential consequence of the fact that reality does not conform to this assumption is money.
Schlesinger’s monetary theory is a sophisticated quantity theory. The value of money depends on the relation between means of payment and demand for cash balances, but this demand is not a simple constant. It includes transaction balances shaped by payment habits, clearing practices, and velocity, as well as reserve balances held against uncertain needs. Credit and clearing therefore modify the monetary equation without abolishing it.
Chapter IV gives the book its central credit-theoretical argument. Deposit banks economize on cash by managing payments for households and firms, gathering idle balances, and transforming them into loans. In doing so they both mediate existing purchasing power and create additional purchasing power, limited by reserve requirements, withdrawal probabilities, and confidence.
Aus der Funktion der Banken, die Kassenführung für die Einzelwirtschaften zu besorgen, entwickelt sich nicht nur ihre kreditschaffende, sondern auch ihre kreditvermittelnde Tätigkeit.
English translation: From the function of the banks in managing the cash operations of individual economic units there develops not only their credit-creating activity but also their credit-mediating activity.
This banking mechanism makes crises intelligible as systemic tensions between credit expansion and the cash base that must ultimately support it. Banks can stretch liquidity statistically, but not abolish the need for settlement. Overexpansion appears when prices, debts, and production commitments become inconsistent with reserve conditions and the public’s demand for money.
The final chapter extends the model internationally. Exchange rates, gold points, metallic standards, paper currencies, bimetallism, capital movements, and central-bank discount policy are treated as institutional closures of the same interdependent system. Central banks arise because decentralized banks would otherwise hold reserves either wastefully or dangerously. Yet discount policy cannot permanently determine the equilibrium rate of interest; it can only influence the path of adjustment through credit restriction, gold flows, and price movements.
The book’s significance lies in its synthesis of Walrasian formalism, Austrian marginal and capital theory, Schumpeterian statics and dynamics, and institutional monetary analysis. Schlesinger makes money, deposits, reserves, and banking policy part of general equilibrium without reducing them to barter relations. Its appendices underscore the claim of formal determinacy, while the analysis of credit, optimism, crisis, and banking shows why monetary economies require more than a simple real-exchange model.
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