# New Classical Economics **The model:** New Classical economics rebuilt macroeconomics on the assumption of **rational expectations** — that people, on average, use all available information and don't make systematic mistakes about the future, including about government policy. The revolutionary implication: if agents *anticipate* what the government will do, they neutralize its predictable effects, so systematic stimulus can't durably change real output. It is the rigorous theoretical foundation of the claim that "the government can't fine-tune the economy." ## Core mechanisms Robert Lucas's rational-expectations revolution (1970s) dismantled the Keynesian consensus by attacking its microfoundations. The **policy ineffectiveness proposition**: if a monetary expansion is anticipated, workers and firms build the resulting inflation into wages and prices immediately, so real output doesn't rise — only inflation does. The **Lucas critique**: the statistical relationships Keynesian models relied on (like the Phillips curve tradeoff between inflation and unemployment) are not stable structural facts but artifacts of a particular policy regime, and they break down precisely when policymakers try to exploit them. The **Real Business Cycle** branch (Kydland, Prescott) went further, arguing that fluctuations are optimal responses to real shocks (technology, productivity) rather than failures needing correction — recessions as efficient adjustments, not problems. And **time inconsistency** (Kydland-Prescott) showed why discretionary policymakers can't be trusted to stick to good policy, making the case for binding rules and independent central banks. ## Right-wing relevance New Classical economics is the academic engine of macroeconomic conservatism. It converted "stimulus doesn't work" from a political slogan into a Nobel-winning theoretical program, supplying rigorous grounds for opposing [[Keynesian Economics]] fiscal activism, favoring rules over discretion, and treating markets as continuously self-correcting. The freshwater/saltwater divide it opened — the "freshwater" schools (Chicago, Minnesota, Rochester) championing market-clearing and policy futility against the "saltwater" ([[New Keynesian Economics]]) schools defending an activist role — remains the deep structure of macro-policy argument, and the vault's fiscal-politics files repeatedly surface it. When conservative economists oppose stimulus on grounds more sophisticated than "debt bad," they are usually drawing on this tradition. ## Critiques and successors The [[2008 Financial Crisis]] was a serious blow: models assuming continuous market-clearing and optimal fluctuations had little to say about a demand-driven collapse, and the crisis revived [[Keynesian Economics]] and [[New Keynesian Economics]] analysis. Critics argue rational expectations is empirically false (people are boundedly rational — see [[Behavioral Economics]]) and that Real Business Cycle theory's "recessions are optimal" implication is grotesque in the face of mass involuntary unemployment. The modern synthesis (DSGE models) blends New Classical methods with New Keynesian frictions. ## See also - [[New Keynesian Economics]] — the saltwater rival across the divide - [[Keynesian Economics]] — the tradition it revolted against - [[Monetarism]] — the earlier anti-Keynesian wave - rational expectations — the founding assumption - [[Behavioral Economics]] — the empirical challenge to rationality