John Maynard Keynes
June 5, 1883 — April 21, 1946 — United Kingdom
John Maynard Keynes was the most influential economist of the twentieth century. His analysis of the Great Depression and his theory that governments should use public spending to counteract economic downturns — "Keynesian economics" — reshaped the relationship between governments and economies for generations. He also helped design the post-World War II international financial system at Bretton Woods.
Cambridge and Early Career
Born on June 5, 1883 in Cambridge, England, Keynes was the son of an economist and grew up immersed in academic life. He studied at Eton and King's College, Cambridge, where he was mentored by the philosopher Bertrand Russell (born May 18) and the economist Alfred Marshall. He joined the British Treasury during World War I and represented the Treasury at the Paris Peace Conference in 1919. Appalled by the vindictive and economically illiterate reparations imposed on Germany, he resigned and wrote The Economic Consequences of the Peace (1919) — a best-selling critique that predicted (accurately) that the punitive settlement would destabilize Europe.
The General Theory
The Great Depression of the 1930s provided the crisis that validated Keynes's emerging theory. Classical economics held that unemployment was self-correcting: wages would fall until all workers were re-employed. Keynes argued that this was wrong — economies could settle into prolonged high-unemployment equilibria that market forces alone could not escape. His The General Theory of Employment, Interest and Money (1936) argued that government deficit spending could stimulate "aggregate demand" and lift an economy out of depression. This theory underpinned Roosevelt's New Deal, postwar welfare states across the Western world, and — after falling from fashion during the free-market 1980s — the stimulus packages deployed after the 2008 financial crisis and the COVID-19 pandemic. His works and major commentaries remain central to economics education.
Did You Know?
Keynes was also an extremely successful speculator who made a fortune on the currency and commodity markets — and nearly lost it all in the 1929 crash, before recovering. He managed King's College Cambridge's endowment with such skill that he grew it to extraordinary size. He was also a member of the Bloomsbury Group, a close friend of Virginia Woolf and E.M. Forster, a major art collector, and briefly married to the Russian ballerina Lydia Lopokova.
Bretton Woods and Legacy
In 1944 Keynes led the British delegation to the Bretton Woods Conference in New Hampshire, which designed the postwar international financial architecture — the International Monetary Fund, the World Bank, and a stable currency exchange system. His proposals for a global reserve currency (the "bancor") were rejected in favor of the U.S.-led dollar system, but his framework shaped the relatively stable postwar global economy. He died on April 21, 1946, of a heart attack. The phrase attributed to him — "In the long run, we are all dead" — remains among the most quoted in the history of economics.