The business cycle describes recurring ups and downs in overall economic activity. For AP Macroeconomics, focus on how the two main phases—expansion and recession—affect output, jobs, and prices.

The Two Main Phases

Expansion

In an expansion, the economy is generally moving toward higher production and greater use of resources.

• Output and income: Firms increase production; household incomes tend to rise with stronger labor demand.

• Employment: Unemployment tends to fall as hiring increases and layoffs slow.

• Spending and confidence: Consumers and firms are typically more willing to spend and invest when future income and sales look stronger.

• Capacity pressures: As the economy runs closer to full use of resources, firms may face bottlenecks (labour shortages, capacity limits), which can influence prices and wages.

A key idea is that expansions are often reinforced by feedback loops: rising income supports spending, which supports production and employment.

Recession

A recession is the contractionary phase when overall activity declines rather than grows.

Recessions reflect economy-wide weakness that can spread across many industries.

• Output and income: Firms cut production when sales drop; household income growth slows or turns negative for some workers.

• Employment: Unemployment tends to rise due to layoffs, reduced hours, and slower hiring.

This chart plots the unemployment rate over time with recessions shaded in gray. The spikes that occur during shaded intervals illustrate how recessions are typically associated with rising unemployment, while expansions are usually periods of falling or stable unemployment. It supports the “output–jobs” linkage emphasized in business-cycle analysis. Source

• Spending and confidence: Lower confidence can reduce consumer purchases (especially durable goods) and discourage business investment.

• Inflation conditions: Price pressures often ease as demand weakens, though inflation outcomes depend on what is happening to costs and supply conditions.

Recessions can also be self-reinforcing: job losses reduce income, which reduces spending, which further reduces sales and production.

How Expansions and Recessions Show Up in Core Indicators

Real GDP and overall activity

• In expansion, real GDP typically grows faster and more broadly across sectors.

• In recession, real GDP declines as firms experience weaker demand and reduce output.

This time-series plot tracks real GDP growth over time and highlights recession periods with gray shading (as dated by the NBER). The negative growth rates that cluster in shaded regions illustrate the contractionary phase of the business cycle, while sustained positive growth is characteristic of expansion. It’s a clean way to connect the concept of “real GDP rises/falls” to actual historical data. Source

Labour market patterns

This stylized Beveridge Curve shows the inverse relationship between the unemployment rate ($U$) and job vacancies ($V$). Points associated with expansions tend to feature relatively low unemployment and higher vacancies, while recessions tend to feature higher unemployment and lower vacancies. The “high V–U ratio” versus “average V–U ratio” rays emphasize that labor markets can look very different depending on where the economy is in the cycle. Source

• In expansion, stronger demand for labour tends to reduce unemployment and increase hours worked.

• In recession, weaker demand for goods and services lowers derived demand for labour, raising unemployment and reducing hours.

Price level pressures (broad patterns)

• In expansion, stronger spending can increase inflationary pressure if production cannot keep up smoothly.

• In recession, inflationary pressure often diminishes because households and firms cut back on spending; however, inflation can behave differently if cost shocks or supply disruptions are present.

Why These Phases Matter for Policy and Decision-Making

Understanding the two phases helps interpret economic news and policy actions:

• During expansion, policymakers may watch for overheating risks (rapid price or wage growth) and financial imbalances.

• During recession, policymakers often focus on stabilising output and employment by supporting spending and restoring confidence.

These phases provide a simple but powerful framework for connecting changes in spending, production, and employment to overall macroeconomic performance.