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The concept of rational expectations was first introduced by John F. Muth in his paper "Rational Expectations and the Theory of Price Movements" published in 1961. Robert Lucas and Thomas Sargent further developed the theory in the 1970s and 1980s which became seminal works on the topic and were widely used in microeconomics.
That school criticized the inconsistencies of Keynesianism in the light of the concept of "rational expectations". The new classicals combined a unique market-clearing equilibrium (at full employment) with rational expectations. The New Keynesians used "microfoundations" to demonstrate that price stickiness hinders markets from clearing.
Her results show that the unstable case did not result in the divergent behavior we see with cobweb expectations but rather the participants converged toward the rational expectations equilibrium. However, the price path variance in the unstable case was greater than that in the stable case (and the difference was shown to be statistically ...
New classicals also introduced rational expectations and argued that governments had little ability to stabilize the economy given the rational expectations of economic agents. Most controversially, new classical economists revived the market clearing assumption, assuming both that prices are flexible and that the market should be modeled at ...
All agents are assumed to maximize utility on the basis of rational expectations. At any one time, the economy is assumed to have a unique equilibrium at full employment or potential output achieved through price and wage adjustment. In other words, the market clears at all times.
If expectations are rational and if markets are characterized by completely flexible nominal quantities and if shocks are unforeseeable white noises, then macroeconomic systems can deviate from the equilibrium level only under contingencies (i.e. random shocks).
This called for greater consistency with microeconomic theory based on rational choice theory, and in particular emphasized the idea of rational expectations. Lucas and others argued that Keynesian economics required remarkably foolish and short-sighted behaviour from people, which totally contradicted the economic understanding of their ...
Part of this adjustment may involve the adaptation of expectations to the experience with actual inflation. Another might involve guesses made by people in the economy based on other evidence. (The latter idea gave us the notion of so-called rational expectations.) Expectational equilibrium gives us the long-term Phillips curve.