H.C. Engelbrecht (1895–1939) received his PhD at Columbia University, with a dissertation on Johann Gottlieb Fichte. While teaching at the University of Chicago, he wrote the bestseller Merchants of Death (1934) with F.C. Hanighen.
Ludwig von Mises: ". The use of money in a market economy is a praxeologically necessary fact. That gold, and not something else, is used as money is merely a historical fact and as such cannot be conceived by catallactics." - Human Action