What Is a Recession? Definitions, Signals and Who Decides

Foundations

A recession is a broad, sustained decline in economic activity: output shrinking, jobs disappearing, incomes and spending falling together. The word carries enormous market weight, yet its definition is looser than most people assume, and the official verdict arrives long after the event, which is why markets spend so much time trading recession PROBABILITIES rather than recessions.

The two definitions

The popular rule of thumb: two consecutive quarters of falling GDP, a “technical recession”. The official US arbiter, the National Bureau of Economic Research (NBER), uses a broader test: a significant decline in activity spread across the economy, judged from jobs, incomes, spending and production, not GDP alone. The two can disagree, and the NBER dates recessions retrospectively, often declaring the start many months after it happened. By the time a recession is official, markets have usually finished trading it.

What actually happens in one

The sequence is familiar from history: demand softens, firms cut investment then jobs, unemployment rises, spending falls further, defaults climb. Earnings fall economy-wide, credit spreads widen, and central banks cut rates. Equities typically peak BEFORE the recession starts and bottom before it ends, which is the eternal frustration: the market is a leading indicator trading on other leading indicators.

The signals markets watch

Because the official call is late, markets rely on early-warning proxies: the inverted yield curve (long the most famous), rising jobless claims, the Sahm rule (a rise in the unemployment rate’s moving average that has historically coincided with recession starts), collapsing PMIs and consumer confidence. Each has false alarms; together they form the dashboard behind every “recession odds” headline. When our jobs and Fed coverage tracks revisions and hiring momentum, this is the question underneath: is the labour market bending, or breaking?