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Clive Day
1871–1951
A Yale professor and historian of commerce, this early 20th-century scholar also brought his expertise to public service during the Paris Peace Conference after World War I. His work linked academic history, economics, and international affairs in a way that still feels strikingly modern.
1 Audiobook
A history of commerce
by Clive Day
About the author
Born on February 11, 1871, Clive Day was an American professor, economist, and historian best known for writing A History of Commerce. He taught at Yale University and built a reputation for explaining how trade, industry, and economic life developed over time in clear, practical terms.
Day studied at the University of Michigan and later in Europe, and his career blended scholarship with public service. During 1918–1919, he served as chief of the Balkan Division of the American Commission to Negotiate Peace in Paris, contributing his regional knowledge at a pivotal moment after World War I.
He died on July 27, 1951. Though not widely known today, Day's career shows how historians and economists once moved easily between the classroom and the world of diplomacy, using careful research to help interpret fast-changing global events.