Frank Horace Hahn (Berlin, 1925 – Cambridge, 2013) was a German economist with British nationality, and a professor of economics at the University of Cambridge from 1972 until his retirement in 1992, when he became Emeritus Professor. He also taught at Birmingham University (1948–1960) and the London School of Economics (1967–1972). Hahn served as Chief Editor of the Review of Economic Studies (1965–1968) and President of the Royal Economic Society (1986–1989).
From 1990 to 1996, he was a professor at the University of Siena, where he also coordinated the Doctoral Program. It was in Italy that he made his main residence. Hahn is renowned for his profound interpretation of the challenges emerging in general equilibrium theory, particularly in relation to the existence and stability of equilibrium. He also contributed to Non-Walrasian economics, particularly in the context of imperfect competition, laying the foundation for a vigorous critique of monetarism.
Some of his key works include:
- General Competitive Analysis (with K. Arrow, 1971)
- On the Notion of Equilibrium in Economics (1973)
- Money and Inflation (1982)
- Money, Growth, and Stability (1985)
While in Siena, Hahn published A Critical Essay on Modern Macroeconomic Theory with R. M. Solow, where he introduced a new macroeconomic model to explain labor market fluctuations, the relationship between wages and employment, and the role of monetary policy.