Recession History
The US has had 12 NBER-dated recessions since 1945. Globally, the IMF identifies 4 'global' recessions over the same period (1975, 1982, 1991, 2009) plus a 5th in 2020. Recession frequency has fallen — the post-1990 'Great Moderation' had only 3 US recessions in 30 years versus 7 in the prior 30 — but individual events (2008, 2020) have been deeper.
Key insights
Frequency down, severity not
Pre-1990, US recessions hit every ~6 years on average. Post-1990 only three: 1990–91, 2001, 2007–09, 2020. The 'Great Moderation' (1985–2007) saw the longest peacetime expansion in US history. But the 2008 and 2020 events were unusually severe — peak unemployment 10% and 14.7% respectively. Lower frequency, higher amplitude when they arrive.
Global recessions are rare and disruptive
The IMF defines a global recession as negative global per-capita GDP growth. By that test, only 1975, 1982, 1991, 2009 and 2020 qualify since 1945. Each was driven by a different mechanism — oil shock, Volcker disinflation, post-Cold-War, financial crisis, pandemic. The next is most likely to come from a financial-crisis-style mechanism (debt overhang, credit freeze) or a geopolitical disruption.
Predicting recessions remains poor
Yield-curve inversion is the most consistent leading indicator — every US recession since 1970 has been preceded by a 10y-3m inversion. But the false-positive rate is real (1966, 1998, 2019 inversions without immediate recession). The 'Sahm Rule' (3-month moving average of unemployment up 0.5pp from cycle low) has fired without fail at recession onset but provides little leading time. Markets are no better.
US recessions — depth and duration since 1945
Peak-to-trough real GDP decline (%) vs duration (months)
Key Finding: COVID was the shortest (2 months) but among the deepest (-9.1%). The Great Recession was the longest of the post-war era (18 months).
Global recessions — IMF dated
Year and trigger of each post-war global downturn
Key Finding: Only 5 global recessions in 80 years. Each had a single dominant cause; recovery patterns differed.
Methodology & caveats
NBER vs the 'two quarters' rule
The popular 'two consecutive quarters of negative GDP growth' definition is not how the NBER dates US recessions. NBER uses a broader committee judgment incorporating employment, income, consumption, retail sales and industrial production. The two definitions usually agree but can diverge — Q1 2022 negative US GDP did not trigger a recession declaration.
Global vs national recessions
Individual countries can be in recession while the world is growing. Global recessions require widespread, synchronized contraction. The IMF threshold for 'global recession' is per-capita real GDP contraction — distinct from advanced-economy recessions which can occur without dragging emerging markets down.
Recovery shapes
V-shape: sharp drop, sharp recovery (1953, 1957, 2020). U-shape: drop, prolonged trough, slow recovery (1981, 2008). L-shape: drop, no recovery for years (Japan 1990s). K-shape: divergent recovery across sectors (2020–21). The pattern is determined more by policy response than by the precipitating shock.