Wilhelm Röpke (1899-1966) was schooled in the tradition of the Austrians and made enormous contributions to the study of political institutions. His powerful anti-Keynesian writings in particular underscore what an outstanding economist he was and the extent to which he was influenced by Mises. Röpke defended sound money and free trade, and attacked welfare. While some consider him a doubter on free markets, he was in fact a passionate advocate of laissez-faire.
Ludwig von Mises: "Monetary calculation and cost accounting constitute the most important intellectual tool of the capitalist entrepreneur, and it was no one less than Goethe who pronounced the system of double-entry bookkeeping one of the finest inventions of the human mind." - Liberalism