John Maynard Keynes
New Keynesian economics

New Keynesian economics developed in the 1990s and early 2000s as a response to the critique that macroeconomics lacked microeconomic foundations. New Keynesianism developed models to provide microfoundations for Keynesian economics. It incorporated parts of new classical macroeconomics to develop the new neoclassical synthesis, which forms the basis for mainstream macroeconomics today.

Two main assumptions define the New Keynesian approach to macroeconomics. Like the New Classical approach, New Keynesian macroeconomic analysis usually assumes that households and firms have rational expectations. However, the two schools differ in that New Keynesian analysis usually assumes a variety of market failures. In particular, New Keynesians assume that there is imperfect competition in price and wage setting to help explain why prices and wages can become " sticky ", which means they do not adjust instantaneously to changes in economic conditions.

Wage and price stickiness, and the other market failures present in New Keynesian models, imply that the economy may fail to attain full employment. Therefore, New Keynesians argue that macroeconomic stabilisation by the government (using fiscal policy) and the central bank (using monetary policy) can lead to a more efficient macroeconomic outcome than a laissez faire policy would.
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