New Classical economics

New Classical economics

New Classical economics is a school of macroeconomic thought that emphasizes microfoundations, rational expectations, and market-clearing analysis developed in the 1970s and 1980s by scholars working in Chicago, Illinois, Stanford University, University of Minnesota, London School of Economics, and University of Rochester. Its proponents include Robert Lucas, Thomas Sargent, Edward C. Prescott, Finn Kydland, Neil Wallace, Robert Barro, and draw on earlier work by Milton Friedman, Ludwig von Mises, Friedrich Hayek, and Frank Knight. The approach reshaped debates during events such as the Great Inflation and influenced policy discussions in institutions like the Federal Reserve System, International Monetary Fund, World Bank, and national treasuries.

Origins and intellectual background

New Classical economics emerged in response to the failures of prevailing Keynesian models during the 1970s energy crisis, the Stagflation episodes, and the intellectual influence of Milton Friedman's monetarist critique in works such as "A Monetary History of the United States" coauthored with Anna Schwartz. Founders synthesized earlier traditions including Walrasian economics, Classical economics, and elements of Austrian School skepticism about price rigidities. Key intellectual antecedents include the development of the Rational expectations hypothesis by John Muth and the microfoundations program in general equilibrium pioneered by Kenneth Arrow and Gerard Debreu. Debates at conferences like the Rochester Conference and institutions such as Cowles Commission and National Bureau of Economic Research accelerated formalization. The school interacted with contemporaries at Cambridge, England, Massachusetts Institute of Technology, and Princeton University, producing influential papers and dissertations that circulated through journals like the Journal of Political Economy and American Economic Review.

Key principles and assumptions

New Classical literature rests on core assumptions: agents form Rational expectations hypothesis consistent with model structure, markets clear through flexible prices and wages as in Walrasian economics, and aggregate fluctuations originate from exogenous shocks such as technology shocks in models influenced by Real Business Cycle theory developed by Edward C. Prescott and Finn Kydland. The approach employs representative-agent formulations popularized by Robert Lucas and treats money primarily as a unit in models inspired by Milton Friedman's analysis of monetary aggregates. Time-consistency problems, highlighted in work by Finn Kydland and Edward C. Prescott, connect to credibility issues faced by central banks such as the European Central Bank and the Federal Reserve System. Policy design incorporates insights from the Barro–Gordon model by Robert Barro and N. Gregory Mankiw's criticisms, linking optimal policy to commitment and reputation issues discussed at Banca d'Italia conferences and IMF workshops.

Formal models and methods

Methodologically, New Classical economists use dynamic stochastic general equilibrium techniques first formalized in overlapping generations and infinite horizon models worked on at University of Chicago and Princeton University. Prominent tools include calibration and numerical simulation pioneered in Real Business Cycle theory papers, rational expectations equilibrium constructions advanced by Thomas Sargent and Neil Wallace, and policy game-theory analyses influenced by Thomas Schelling and Robert Aumann. Foundational models include the Lucas critique which challenges structural interpretation of parameters using examples from Phillips curve analyses, and the microfoundations program that draws on Arrow–Debreu frameworks and optimization problems used by David Romer and Olivier Blanchard. Econometric identification debates involved scholars at University of Chicago, Cowles Foundation, London School of Economics, and Massachusetts Institute of Technology with methods such as instrumental variables in the tradition of James Heckman and structural vector autoregressions popularized by Christopher Sims.

Policy implications and debates

New Classical conclusions often implied skepticism toward activist stabilization policies advocated by John Maynard Keynes's interpreters at Bretton Woods Conference-era institutions. The emphasis on rational expectations and policy rules influenced adoption of rules-based frameworks such as Inflation targeting implemented by central banks including the Reserve Bank of New Zealand, Bank of England, and the European Central Bank. Time-consistency and credibility arguments shaped advocacy for independent central banks following models debated at Federal Reserve System symposiums and in works by Alan Greenspan allies. Debates over fiscal policy drew on the Ricardian equivalence proposition associated with David Ricardo's legacy and extended by Robert Barro in policy forums at Harvard University and Yale University. The role of shocks versus frictions in explaining the Great Recession led to policy discussions in parliaments and legislative hearings in United States Congress and European Parliament.

Criticisms and alternatives

Critics from schools such as New Keynesian economics, Post-Keynesian economics, Behavioural economics, Austrian School, and Institutional economics argued that New Classical reliance on representative agents, perfect markets, and rational expectations neglected nominal rigidities, heterogeneous agents, informational frictions, and financial market imperfections highlighted by events like the 2007–2008 financial crisis. Alternative modeling strategies include sticky-price frameworks advanced at MIT and Princeton University, heterogeneous-agent models developed at University of Chicago and Stanford University, agent-based computational economics from Santa Fe Institute, and behavioural modifications influenced by Daniel Kahneman and Amos Tversky. Ongoing debates take place at conferences hosted by Royal Economic Society, American Economic Association, Econometric Society, and policy institutions such as the International Monetary Fund and Bank for International Settlements.

Category:Macroeconomic schools of thought