Innovation & Wealth › Mass production & the consumer age › Crash of 1929 and the Great Depression
John Maynard Keynes and the General Theory
1883–1946; General Theory 1936· Innovator or entrepreneur· Innovators & entrepreneurs
Well documentedSolid records, texts or physical evidence.
British economist whose 1936 General Theory argued governments should spend to fight slumps when private demand collapses.
See it on the Innovation & Wealth map →What happened
Keynes (1883–1946), a Cambridge economist, first gained fame attacking the 1919 Versailles reparations as too harsh. In The General Theory of Employment, Interest and Money (1936) he argued that economies can stay stuck with mass unemployment because one person's spending is another's income; if everyone cuts back, incomes fall further. The cure: cheaper credit and, if needed, government borrowing and spending. A bold investor, he nearly went broke in 1920, then grew King's College's fund well ahead of the market.
Impact on society and the economy
'Keynesian' demand management guided Western policy from the 1940s to the 1970s and returned in the 2008 and 2020 crises. Critics blame it for chronic deficits and inflation.
Think of it like
Like a shopping center: when anchor tenants cut back, foot traffic falls for every store, and each store's cutbacks make it worse.
Fortune, legacy and how we know
His books and 30-volume collected writings, British Treasury papers, King's College investment records, and the three-volume biography by Robert Skidelsky.
Still debated
Economists still argue over what Keynes really meant and how large government-spending 'multipliers' are, especially when public debt is already high.
Connections (2)
▸John Maynard Keynes and the General Theory shaped the economic policy of Postwar boom and the rise of the middle classMostly agreed
The connection
Keynes argued governments should spend to fight slumps and keep demand high. After the war, Western governments made full employment a stated goal, with Britain's 1944 white paper, the US Employment Act of 1946 and active budget policy. Low unemployment and steady growth seemed to vindicate him, until 1970s stagflation broke the consensus.
When and how
Britain's 1944 employment white paper; the US Employment Act of 1946 and Council of Economic Advisers; the 1964 Kennedy–Johnson tax cut; Time's 1965 cover quoting Friedman: 'We are all Keynesians now.'
How sure are we?
Government documents and budgets explicitly cite Keynesian aims; how much growth those policies produced, rather than other forces, is less certain.
Debates
Did Keynesian policy cause the boom or merely coincide with it? Rebuilding, cheap oil, technological catch-up and trade growth also mattered.
▸John Maynard Keynes and the General Theory helped design Bretton Woods systemWell documented
The connection
Keynes led Britain's delegation and drafted an ambitious plan: an international clearing union with its own currency, the 'bancor,' that would pressure surplus countries as well as debtors. The US, the dominant creditor, preferred Treasury official Harry Dexter White's smaller, dollar-centered fund. White's plan largely won, but Keynes shaped many details of the IMF and World Bank.
When and how
Anglo-American talks, 1942–1944, and the Bretton Woods conference, July 1944; Keynes, White and US Treasury Secretary Henry Morgenthau.
How we know
Both men's draft plans, the conference records and their correspondence survive, published in Keynes's collected writings and held in US Treasury archives.
Debates
How much of the final system was Keynes's versus White's is debated, as is whether the bancor would have prevented later imbalances; China's central bank revived the idea in 2009.