F.A. Hayek (1899–1992) was the most important representative of the “fourth generation” of the Austrian school of economics and the only one so far to receive the Nobel Prize. His many contributions are highlighted by Peter Klein.

Hayek considered himself a socialist until he read Mises's ​Socialism, where Mises argued that prices and private property are a requirement of economic calculation. He attended Mises’s private seminar along with other top young economists and went on to build upon Mises’s monetary theory. He developed an explanation of business cycles brought on by bank credit expansion encouraging malinvestments in capital.

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Jeffrey Herbener discusses the significant contributions of Frank Fetter (1863–1949) on the implications of the marginalist revolution. Fetter identified with not only the Austrian school but in particular the branch that developed Menger’s causal-realist approach to economics.

Fetter’s major achievement was to reform the Classical theory of income distribution to bring it into line with subjective value theory. In doing so, he stressed the need for economic theory to realize the importance of capital and its place in industrial affairs.

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A strong member of the “second generation of the Austrian school of economics,” Eugen von Böhm-Bawerk (1851–1914) and his works are discussed by Peter Klein. Böhm-Bawerk did much to extend and further develop Menger’s theories of value, price, capital, and production. Included in his work of the two volume Capital and Interest is a devastating critique of Marx’s exploitation theory. Böhm-Bawerk explained that far from being exploited, the workers are actually accommodated, being paid in advance of the produced goods being sold.

In the second volume of Capital and Interest, Böhm-Bawerk explained the time consuming nature of production and how it relates to interest. Roundabout production methods are more productive but come at a cost of forgoing current consumption during the process of accumulating the capital. This became the basis for his time preference theory of interest as well as the foundations for the Austrian theory of the business cycle. Böhm-Bawerk also presented a clear example diminishing marginal utility and explained how real prices, as opposed to hypothetical equilibrium prices, are determined.

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