[5] Cassel's perspective on economic reality, and especially on the role of interest, was rooted in British neoclassicism and in the nascent Swedish schools.

The stability of exchange rates was widely believed to be crucial for restoring the international trade and for its further stable and balanced growth.

He was a member of many committees dealing with matters of state in Sweden and devoted much labour to the creation of a better system of budget exposition and control (1905–21).

[9] In addition to his books in Swedish, he published the following works in other languages: Das Recht auf den vollen Arbeitsertrag (1900), The Nature and Necessity of Interest (1903), Theoretische Sozialökonomie (1919).

His Memorandum on the World's Monetary Problems, published by the League of Nations for the International Financial Conference in Brussels in 1920, attracted widespread attention.

[9][10] Some of his notable students include Nobel Prize in Economics laureates Bertil Ohlin and Gunnar Myrdal, and the future Moderate Party leader Gösta Bagge.