Economy

Economic Theories

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Theory
Key Economist
Year Proposed
Core Idea
School of Thought
Classical Economics
Adam Smith1776Free markets self-regulate through the invisible handClassical
Comparative Advantage
David Ricardo1817Countries benefit by specializing in goods they produce most efficientlyClassical
Marxian Economics
Karl Marx1867Capitalism exploits labor; surplus value accrues to capital ownersMarxist
Marginal Utility Theory
Carl Menger1871Value is determined by the additional satisfaction from one more unitAustrian
General Equilibrium
Leon Walras1874All markets simultaneously reach equilibrium through price adjustmentNeoclassical
Keynesian Economics
John Maynard Keynes1936Government spending can stabilize economies during recessionsKeynesian
Creative Destruction
Joseph Schumpeter1942Innovation constantly destroys old industries to create new onesEvolutionary
Game Theory
John von Neumann1944Strategic interactions where outcomes depend on all participants' choicesMathematical
Monetarism
Milton Friedman1963Controlling money supply is the best way to manage the economyChicago School
Human Capital Theory
Gary Becker1964Education and training are investments that increase productive capacityChicago School
Efficient Market Hypothesis
Eugene Fama1970Asset prices fully reflect all available informationChicago School
Rational Expectations
Robert Lucas1972People form expectations using all available information rationallyNew Classical
Public Choice Theory
James Buchanan1962Politicians and bureaucrats act in self-interest, not public interestVirginia School
Supply-Side Economics
Arthur Laffer1974Lowering taxes increases economic growth and can raise total revenueSupply-Side
New Trade Theory
Paul Krugman1979Economies of scale and network effects shape international trade patternsNew Keynesian
Real Business Cycle Theory
Finn Kydland1982Economic fluctuations are driven by real shocks, not monetary factorsNew Classical
Endogenous Growth Theory
Paul Romer1986Innovation and knowledge are key internal drivers of economic growthNew Growth
Institutional Economics
Douglass North1990Institutions (rules, norms, enforcement) are the primary drivers of economic performanceInstitutional
Behavioral Economics
Daniel Kahneman1979Psychological biases cause people to deviate from rational economic decisionsBehavioral
Nudge Theory
Richard Thaler2008Small design changes in choice architecture can guide better decisionsBehavioral
Modern Monetary Theory
Stephanie Kelton2020Sovereign currency issuers cannot run out of money; inflation is the real constraintPost-Keynesian
Austrian Business Cycle
Ludwig von Mises1912Artificial credit expansion causes unsustainable booms followed by bustsAustrian
Tragedy of the Commons
Garrett Hardin1968Shared resources are depleted when individuals act in self-interestEcological Economics
Moral Hazard
Kenneth Arrow1963People take more risks when insulated from consequencesInformation Economics
Impossible Trinity
Robert Mundell1963A country cannot have free capital flow, fixed exchange rate, and independent monetary policy simultaneouslyInternational

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