Irving Fisher

Born in 1867, Irving Fisher became one of the most influential American economists of the early 20th century. He studied at Yale and spent most of his academic career there, building a reputation for bringing mathematical precision into economics at a time when the field was still taking shape.

Fisher made major contributions to the study of capital, interest, money, and price levels. He is especially remembered for work connected to the quantity theory of money, the equation of exchange, and what later became known as the Fisher effect, linking interest rates and inflation. After the Great Depression, he also wrote powerfully about debt deflation, exploring how falling prices and heavy debt can deepen economic downturns.

Beyond his academic work, Fisher was active in public debate and social causes, writing widely and trying to bring economic ideas to a broader audience. He died in 1947, but his work remains a lasting part of how economists think about inflation, debt, and the forces that shape modern economies.