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The neoclassical synthesis is a macroeconomic theory that emerged in the mid-20th century, combining the ideas of neoclassical economics with Keynesian economics. The synthesis was an attempt to reconcile the apparent differences between the two schools of thought and create a more comprehensive theory of macroeconomics.
Post-Keynesian economists, on the other hand, reject the neoclassical synthesis and, in general, neoclassical economics applied to the macroeconomy. Post-Keynesian economics is a heterodox school that holds that both neo-Keynesian economics and New Keynesian economics are incorrect, and a misinterpretation of Keynes's ideas. The post-Keynesian ...
The revolution was set against the orthodox classical economic framework, and its successor, neoclassical economics, which, based on Say's law, argued that unless special conditions prevailed, the free market would naturally establish full employment equilibrium with no need for government intervention. This view held that employers will be ...
The attempt to combine neo-classical microeconomics and Keynesian macroeconomics would lead to the neoclassical synthesis [30] which was the dominant paradigm of economic reasoning in English-speaking countries from the 1950s till the 1970s. Hicks and Samuelson were for example instrumental in mainstreaming Keynesian economics.
Therefore, they also accept the monetarist and new Keynesian view that monetary policy can have a considerable effect in the short run. [18] The new classical macroeconomics contributed the rational expectations hypothesis and the idea of intertemporal optimisation to new Keynesian economics and the new neoclassical synthesis. [12]
During the Great Depression of the 1930s, Keynes spearheaded a revolution in economic thinking, challenging the ideas of neoclassical economics that held that free markets would, in the short to medium term, automatically provide full employment, as long as workers were flexible in their wage demands.
Despite its prevalence, the neoclassical synthesis had its Keynesian critics. A strain of disequilibrium or "non-Walrasian" theory developed [70] that criticized the synthesis for apparent contradictions in allowing disequilibrium phenomena, especially involuntary unemployment, to be modeled in equilibrium models. [71]
After World War II, Paul Samuelson used the term neoclassical synthesis to refer to the integration of Keynesian economics with neoclassical economics. The idea was that the government and the central bank would maintain rough full employment, so that neoclassical notions—centered on the axiom of the universality of scarcity—would apply.