Irving Fisher

Yale economist who formalized the quantity theory, index numbers, and debt-deflation depressions.

Specifications & Metrics

lifespan

1867-1947

nationality

American

school

Neoclassical

Core Principles & Analysis

• The Purchasing Power of Money (1911) gave the quantity equation MV = PT its standard form.
• His debt-deflation theory of great depressions (1933) was revived after the 2008 crisis.
• He patented an index-visible card filing system in 1913 and sold it to Kardex Rand, later Remington Rand, in 1925.

Sources

• Econlib Concise Encyclopedia of Economics: Irving Fisher