A boom is a phase of the business cycle in which output, spending, employment, and investment rise quickly, often pushing the economy above its normal capacity level.
What a boom looks like
During a boom, economists often see:
- strong demand growth,
- falling unemployment,
- rising business investment,
- fast credit expansion,
- asset-price strength,
- upward pressure on wages and prices.
In macroeconomic terms, a boom often means the output gap has turned positive: actual production is running above sustainable trend or capacity.
Why booms can feel good and still create problems
Booms usually improve income and employment in the short run. But if demand rises faster than productive capacity, the same expansion can create inflation, leverage, and asset mispricing.
That is why central banks and fiscal authorities watch booms carefully. The policy challenge is deciding whether the expansion reflects healthy productivity growth or overheating that may end in a bust.
Boom versus long-run growth
A boom is cyclical, not necessarily structural. An economy can enjoy a temporary boom without permanently raising its long-run growth rate. Distinguishing between the two is a core macroeconomic task.