Keynesian economics (/ˈkeɪnziən/KAYN-zee-ən; sometimes Keynesianism, named after British economist John Maynard Keynes) are the various macroeconomic theories and models of how aggregate demand (total spending in the economy) strongly influences economic output and inflation.[1] In the Keynesian view, aggregate demand does not necessarily equal the productive capacity of the economy. It is influenced by a host of factors that sometimes behave erratically and impact production, employment, and inflation.[2]
Keynesian economists generally argue that aggregate demand is volatile and unstable and that, consequently, a market economy often experiences inefficient macroeconomic outcomes, including recessions when demand is too low and inflation when demand is too high. Further, they argue that these economic fluctuations can be mitigated by economic policy responses coordinated between government and central bank. In particular, fiscal policy actions taken by the government and monetary policy actions taken by the central bank, can help stabilize economic output, inflation, and unemployment over the business cycle.[3] Keynesian economists generally advocate a regulated market economy – predominantly private sector, but with an active role for government intervention during recessions and depressions.[4]
Keynesian economics developed during and after the Great Depression from the ideas presented by Keynes in his 1936 book, The General Theory of Employment, Interest and Money.[5] Keynes' approach was a stark contrast to the aggregate supply-focused classical economics that preceded his book. Interpreting Keynes's work is a contentious topic, and several schools of economic thought claim his legacy.
Keynesian economics, as part of the neoclassical synthesis, served as the standard macroeconomic model in the developed nations during the later part of the Great Depression, World War II, and the post-war economic expansion (1945–1973). It was developed in part to attempt to explain the Great Depression and to help economists understand future crises. It lost some influence following the oil shock and resulting stagflation of the 1970s.[6] Keynesian economics was later redeveloped as New Keynesian economics, becoming part of the contemporary new neoclassical synthesis, that forms current-day mainstream macroeconomics.[7] The advent of the financial crisis of 2007–2008 sparked renewed interest in Keynesian policies by governments around the world.[8]
^Blinder, Alan S. "Keynesian Economics". www.econlib.org. The Concise Encyclopedia of Economics. Archived from the original on 25 February 2021. Retrieved 13 March 2021.
^"What Is Keynesian Economics? – Back to Basics – Finance & Development, September 2014". www.imf.org. Archived from the original on 25 October 2015. Retrieved 2 November 2015.
^O'Sullivan, Arthur; Sheffrin, Steven M. (2003). Economics: Principles in Action. Upper Saddle River: Pearson Prentice Hall. ISBN 978-0-13-063085-8.
^Blinder, Alan S. "Keynesian Economics". Concise Encyclopedia of Economics. Library of Economics and Liberty. Archived from the original on 14 September 2017. Retrieved 23 August 2017.
^Hunt, Michael H. (2004). The World Transformed: 1945 to the present. New York, New York: Oxford University Press. p. 80. ISBN 9780199371020.
^Cite error: The named reference K rev. and critics was invoked but never defined (see the help page).
^Woodford, Michael (2009), "Convergence in Macroeconomics: Elements of the New Synthesis" (PDF), American Economic Journal: Macroeconomics, 1 (1): 267–79, doi:10.1257/mac.1.1.267, archived (PDF) from the original on 18 February 2021, retrieved 5 September 2020
^Staff, Spiegel (4 November 2008). "Economic Crisis Mounts in Germany". Der Spiegel. Archived from the original on 29 January 2012. Retrieved 13 August 2011.
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