Short-run changes in unemployment are driven primarily by the business cycle and the sluggish way wages adjust to new economic conditions. Understanding these two forces explains why unemployment spikes during recessions and falls during expansions.

Business cycles and cyclical unemployment

Economic cycles (also called business cycles) are the recurring pattern of expansion and contraction in overall economic activity.

During an expansion, GDP rises, businesses see stronger demand for their products, and they hire more workers. Unemployment falls. The late 1990s dot-com boom is a classic example: rapid growth in tech spending pulled unemployment below 4%.
During a contraction (recession), demand drops, businesses cut costs through layoffs and hiring freezes, and unemployment rises. In the 2008 financial crisis, the U.S. unemployment rate jumped from about 5% to 10% in roughly two years.

The unemployment that rises and falls with these cycles has a specific name: cyclical unemployment. It captures workers who lose jobs because the economy contracted, not because their skills are outdated or they're between jobs. Construction workers and manufacturing employees are especially vulnerable to cyclical swings because demand for housing and durable goods is highly sensitive to economic conditions.

Sticky Wages and Unemployment

Why wages don't just adjust

In a textbook-perfect labor market, a drop in demand for workers would push wages down until everyone willing to work at the new, lower wage found a job. In reality, wages are sticky downward, meaning they resist falling even when economic conditions weaken. Several forces keep wages from dropping quickly:

Long-term contracts lock in wage rates for months or years.
Minimum wage laws set a legal floor below which wages cannot fall.
Efficiency wage theory suggests employers deliberately pay above the market-clearing wage to boost productivity, reduce turnover, and attract better applicants.

Economic cycles and unemployment, Reading: The Business Cycle: Definition and Phases | Introduction to Business

How sticky wages worsen unemployment

When a recession hits and labor demand falls, here's what happens step by step:

Businesses face lower demand for their goods and services, so they need fewer workers.
In a flexible market, wages would drop to a new, lower equilibrium, and most workers would stay employed at the reduced pay.
Because wages are sticky, they stay above that new equilibrium level.
At the higher wage, the quantity of labor supplied (people wanting jobs) exceeds the quantity demanded (jobs businesses are willing to offer).
The gap between supply and demand shows up as unemployment.

The result is that unemployment ends up higher than it would be if wages could adjust freely. The slow recovery in employment after the 2008 financial crisis illustrates this: even as GDP began growing again, wages stayed elevated relative to weak demand, and firms were slow to rehire.

Supply and Demand Analysis of Unemployment

The labor market framework

You can analyze unemployment using the same supply-and-demand model you've used for goods markets, just applied to labor.

Labor supply is the number of workers willing and able to work at various wage levels. Higher wages attract more workers, so the supply curve slopes upward.
Labor demand is the number of workers firms want to hire at various wage levels. Higher wages raise costs, so the demand curve slopes downward.
Equilibrium occurs where the two curves intersect. The equilibrium wage ( $w_e$ ) and equilibrium employment level ( $L_e$ ) represent the point where every worker willing to work at $w_e$ has a job, and every firm willing to pay $w_e$ has filled its positions.

Economic cycles and unemployment, Cyclical Unemployment | Macroeconomics

Shifts in labor demand

Rightward shift (increase in demand): Economic growth, new technology adoption, or rising consumer spending makes firms want more workers. Wages and employment both rise. The tech industry in the 2010s is a good example.
Leftward shift (decrease in demand): A recession or an industry-specific shock reduces the need for workers. Wages and employment both fall. The hospitality industry during the COVID-19 pandemic saw a dramatic leftward shift.

Sticky wages and labor market disequilibrium

When labor demand shifts left during a recession but wages remain stuck above the new equilibrium:

The quantity of labor supplied at the prevailing wage exceeds the quantity demanded.
That surplus of labor is unemployment. There are more people looking for work at the going wage than there are jobs available.
This pattern helps explain persistent high unemployment in some European countries with strong labor protections, where institutional factors make wages especially resistant to downward adjustment.

Policy Responses and Types of Unemployment

Government tools for fighting unemployment

Policymakers have two main levers to combat rising unemployment during downturns:

Monetary policy: The central bank lowers interest rates, making borrowing cheaper. This encourages business investment and consumer spending, which raises aggregate demand and, in turn, labor demand.
Fiscal policy: The government increases its own spending or cuts taxes to inject money into the economy. Both approaches aim to boost aggregate demand and create jobs.

These demand-side policies are best suited for cyclical unemployment because the root problem is insufficient demand.

Matching the policy to the type of unemployment

Not all unemployment responds to the same fix:

Cyclical unemployment rises and falls with the business cycle. Stimulating aggregate demand through monetary or fiscal policy is the standard remedy.
Structural unemployment comes from a mismatch between workers' skills and available jobs. A coal miner in a region shifting to renewable energy faces structural unemployment. Short-term demand stimulus won't solve this; it requires longer-term investments like retraining programs and education.
Frictional unemployment is the normal, short-term unemployment that occurs as people search for new jobs or enter the workforce for the first time. It exists even in a healthy economy and isn't something short-run policy typically targets.