New Classical Economics emerged in the 1970s as a response to perceived failures of Keynesian macroeconomics, particularly its inability to explain stagflation. It is associated with economists including Robert Lucas Jr., Thomas Sargent, Neil Wallace, Robert Barro, and Edward Prescott.
The school rests on three core commitments:
- Rational expectations: agents form forecasts using all available information and the true structure of the economy, so they do not make systematic errors. This hypothesis was originally formulated by John Muth (1961) and imported into macroeconomics by Lucas.
- Continuous market clearing: prices and wages adjust so that markets, including labor, are always in equilibrium. Unemployment is treated as voluntary or frictional rather than as disequilibrium.
- Microfoundations: aggregate relationships must be derived from the optimizing behavior of households and firms, not from ad hoc aggregate equations.
The most famous policy implication is the Lucas critique (1976), which argues that econometric models estimated on past data cannot reliably predict the effects of new policies, because agents' decision rules change when the policy regime changes. A related result is the policy ineffectiveness proposition of Sargent and Wallace (1975), which holds that anticipated monetary policy cannot affect real output or employment, only unanticipated shocks can.
New Classical analysis reshaped business cycle theory. Lucas's monetary misperceptions model gave way in the 1980s to Real Business Cycle (RBC) theory developed by Kydland and Prescott (1982), which explains fluctuations through technology shocks in a frictionless competitive economy. Their broader contribution on time inconsistency (1977) became the standard justification for central bank independence and rules-based policy.
Critics, including New Keynesians, accept rational expectations and microfoundations but reject continuous market clearing, instead modeling nominal rigidities and imperfect competition. Lucas received the Nobel Prize in 1995; Kydland and Prescott in 2004; Sargent in 2011.
Example
In 1976, Robert Lucas published "Econometric Policy Evaluation: A Critique," arguing that the Federal Reserve could not exploit a stable Phillips curve trade-off because firms and workers would adjust expectations to any announced policy rule.
Frequently asked questions
Both stress the limits of activist policy, but Monetarism (Friedman) allowed short-run real effects of monetary policy through adaptive expectations, while New Classicals use rational expectations and argue anticipated money is neutral even in the short run.
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