Knut Wicksell

In his 1898 book, "Interest and Prices," Knut Wicksell introduced the concept of the natural rate of interest, which is determined by the real marginal productivity of capital in an economy. He argued that inflation or deflation occurs when the market bank loan rate diverges from this underlying natural rate. This theory became a cornerstone of modern monetary policy.

The cumulative process is Wicksell's economic theory explaining how an economy spirals into inflation or deflation when bank loan rates are set below or above the natural rate of interest. If banks charge a rate lower than the natural return on capital, businesses will borrow heavily, driving up demand and causing cumulative price inflation. This was a radical departure from classical quantity theory.

Knut Wicksell's extensive work heavily influenced two distinct movements: the Austrian School and the Stockholm School. His theories on capital, interest, and money provided the foundation for the Austrian business cycle theory later developed by Ludwig von Mises. Simultaneously, his pioneering macroeconomic ideas inspired his Swedish followers to establish the Stockholm School.

Knut Wicksell's most famous written work is his 1898 book, "Interest and Prices" (Geldzins und Güterpreise). In this text, he introduced the concept of the natural rate of interest and the cumulative process of price fluctuations. The book laid the theoretical groundwork for modern central banking and macroeconomic stabilization.