Keynesianism

Keynesianism is a school of economic thought and a political approach based on the work of the British economist John Maynard Keynes. Its central claim is that a market economy does not automatically return to full employment. When households and firms cut spending at the same time, total demand can fall and stay low, leaving people out of work for long periods. Keynesians argue that governments can and should fill the gap, by spending more or cutting taxes in downturns and doing the reverse in booms. As a political outlook it sits between laissez-faire liberalism and socialism: it keeps private ownership and markets but gives the state a large role in stabilizing them.

Keynes published The General Theory of Employment, Interest and Money in 1936, during the Great Depression, when classical economics struggled to explain mass unemployment. His ideas spread quickly among economists, and the American economist Alvin Hansen helped bring them to the United States. Keynes led the British delegation at the Bretton Woods conference in 1944, which created the International Monetary Fund and the World Bank. After the Second World War, most Western governments adopted Keynesian demand management alongside welfare states, and economists such as Paul Samuelson blended Keynes with older theory in what was called the neoclassical synthesis. The period from about 1945 to the early 1970s is often described as the Keynesian era. Stagflation in the 1970s, a mix of high inflation and high unemployment, damaged its reputation, and monetarism and other schools gained ground. Interest revived after the 2008 financial crisis, when many governments used large stimulus packages.

The neoclassical synthesis combined Keynesian short-run analysis with classical long-run theory and dominated postwar textbooks. New Keynesian economics, developed from the 1980s, explains why prices and wages adjust slowly and underpins much modern central banking. Post-Keynesians, following Joan Robinson and Hyman Minsky, stress uncertainty, inequality and financial instability and favor a more active state. Politically, Keynesian ideas have been used by social democrats, liberals and some conservatives.

Monetarists, led by Milton Friedman, argued that active fiscal policy is slow, poorly timed and likely to cause inflation, and that stable money growth matters more. New classical economists argued that people anticipate policy changes, which can weaken their effect. Fiscal conservatives say Keynesian ideas encourage permanent deficits and rising public debt, since governments find it easier to spend in slumps than to cut in booms. Some on the left argue that Keynesianism stabilizes capitalism without changing who owns or controls it.

Keynesian thinking shaped the British 1944 white paper on employment policy, the US Employment Act of 1946 and economic management across Western Europe in the postwar decades. Automatic stabilizers, such as unemployment benefits that rise in recessions, reflect Keynesian logic. In 2008 and 2009 many countries, including the United States, China and members of the European Union, passed fiscal stimulus programs, and similar measures were used during the COVID-19 pandemic.