Karl Menger as Son of Carl Menger

Although their contributions to the history of economic thought and their scholarly reputations are firmly established, relatively little is known about the relationship between Carl Menger, founder of the Austrian School of economics, and his son, Karl Menger, the mathematician, geometer, logician, and philosopher of science, whose famous Mathematical Colloquium at the University of Vienna was central to the early literature on the existence of general equilibrium and the concomitant development of mathematical economics. The present paper begins to fill this gap. Karl Menger’s diaries, held in the David M. Rubenstein Rare Book and Manuscript Library at Duke University, offer insight into the intimate relationships within the Menger clan, Karl’s work and study habits, and the development of his uncommonly broad intellect, as well as on life in a vanquished city, Vienna, in the immediate wake of the humiliating defeat of the First World War and the disintegration of the Habsburg Empire.