What Is the Economic Cycle? The Four Stages Explained

Search Fintrev

Search our guides, reviews and glossary.

The economic cycle is the recurring rise and fall of economic activity over time: a period of expansion that tops out at a peak, a contraction that bottoms out at a trough, and then a new expansion. It is also called the business cycle, and the two terms mean the same thing. The four stages follow each other in a fixed order, but how long each one lasts, and how deep or strong it gets, varies widely from one cycle to the next.

What Is the Economic Cycle?

Economies do not grow in a straight line. Output, jobs, incomes and spending tend to rise together, then slow and fall together, then recover, fluctuating around the economy’s long-run growth path. A full cycle is measured from one peak to the next or from one trough to the next. The sequence is fixed, but there is no schedule for when a peak will arrive or how long a downturn will last, which is why so much effort goes into reading indicators.

The Four Stages of the Economic Cycle

Expansion

During an expansion, the economy grows. Production increases, employment and wages rise, corporate profits improve and consumer confidence strengthens. Credit is generally easier to get, and interest rates are often low early in the stage, which makes borrowing cheap for households and businesses.

Expansion is sometimes split into two parts. Recovery (early expansion) is the period just after a trough, when activity starts climbing back from its low. Boom is the later, faster part, when demand is strong and capacity gets tight. A long period of growth can push up the money supply and demand enough to raise inflation (see the U.S. inflation rate by year).

Peak

The peak is the highest point of activity before the economy turns down. Growth reaches its maximum, and indicators may level off briefly before reversing. Peaks often come with imbalances built up during the boom: inflation running hot, excess inventory, stretched asset prices or heavy borrowing. When businesses suspect the top is near, they may start trimming budgets and hiring plans.

Contraction

In a contraction, activity declines. Output slows or falls, employment drops and spending weakens. Because businesses do not always cut production as fast as demand falls, unsold goods can pile up, which puts downward pressure on prices. A contraction that is significant and widespread is a recession. A very deep and prolonged one is called a depression.

Trough

The trough is the low point, where the decline stops and the next expansion begins. Unemployment is typically elevated, credit is tighter and spending and income have stagnated. Households and businesses often use this period to restructure debt, cut costs or reposition for growth.

How the Economic Cycle Is Measured

The NBER Dating Committee

In the U.S., the NBER’s Business Cycle Dating Committee is the recognized authority for marking peaks and troughs. It defines a recession as a significant decline in economic activity spread across the economy that lasts more than a few months. Rather than relying on a single statistic, the committee looks at a range of monthly and quarterly measures, including real GDP, real personal income excluding government transfers, nonfarm payroll employment, real consumer spending and industrial production.

The committee waits until the data clearly confirm a turning point, so announcements usually come months after the peak or trough itself. For example, it placed the most recent U.S. monthly peak in February 2020 but announced that date in June 2020. It also identified a quarterly peak in the fourth quarter of 2019, because monthly and quarterly data can place a turning point in different periods. In real time, analysts can only estimate the current stage from indicators.

Cycle Length

Since the 1950s, U.S. cycles have averaged about five and a half years, but individual cycles have ranged widely. The early 1980s produced a peak-to-peak cycle of about 18 months. The expansion that began in June 2009 lasted until February 2020, the longest on record in the U.S., and the recession that followed, ending in April 2020, was the shortest.

Leading, Coincident and Lagging Indicators

Indicators are often grouped by when they tend to move relative to the cycle:

• Leading indicators tend to change before the economy turns, such as new orders, building permits, stock prices and the shape of the yield curve.
• Coincident indicators move with the economy, such as employment, industrial production and personal income.
• Lagging indicators confirm a turn after it has happened, such as the unemployment rate and some measures of inflation like the Consumer Price Index.

No single indicator reliably calls turning points, so forecasters combine several.

Example of the Economic Cycle

Hypothetical example for illustration only. Suppose a country’s real GDP, measured as an index, moves like this over three years:

Output grows through Year 1, slowing as it approaches the peak in Q2 of Year 2. Late expansion is that stretch just before the peak, where output is still rising but flattening. Late contraction is the stretch just before the trough, where output is still falling but more slowly. Measured peak to trough, this contraction lasted three quarters and cut output by about 3.1% (from 104.2 to 101.0) before recovery began.

How the Economic Cycle Is Used

Economic Policy

Governments and central banks try to smooth the cycle rather than eliminate it. With fiscal policy, a government can increase spending or cut taxes during a downturn, often running larger deficits, to support demand. During a strong expansion it can do the reverse, raising taxes or cutting spending to cool an overheating economy.

With monetary policy, a central bank can lower interest rates and ease credit in a contraction to encourage borrowing and investment. During an expansion it can raise rates and slow credit growth to keep inflation in check. The ups and downs of policy rates across these phases are often called the interest rate cycle.

Investing

The investing cycle and the economic cycle are related but not identical. Stock prices reflect expectations about future earnings, so markets often move before the economic data do: stocks can fall during a slowdown while GDP is still growing, and broad indexes such as the S&P 500 have at times bottomed before the economy reached its trough.

Investors also adjust sector exposure by stage. Expansions are often associated with strength in technology, capital goods and energy, which depend on business investment and strong demand. During contractions, investors frequently turn to defensive areas such as utilities, consumer staples and healthcare, where demand for necessities holds up better.

Business Planning

Companies that understand how their sales track the broader economy can plan around it. A cyclical business seeing signs of a coming downturn might delay expansion, reduce inventory and build cash reserves. Near a trough, the same business might prepare to hire and invest so it can capture demand as the recovery takes hold.

What Causes Economic Cycles?

There is no single agreed cause. Major schools of thought emphasize different drivers:

• Monetarism links the economic cycle to the credit cycle. Changes in the money supply and interest rates make borrowing cheaper or more expensive for households, businesses and governments, which raises or lowers spending. Monetarists argue that steady growth in the money supply supports stability.
• Keynesian economics focuses on aggregate demand, especially volatile business investment. When sentiment turns negative, firms invest less, demand falls, workers are laid off and lower incomes cut spending further. Keynesians see government stimulus as a way to break that loop.
• Real business cycle theory attributes fluctuations mainly to real shocks, such as changes in technology or productivity, rather than to money or demand.
• Austrian economics traces cycles to artificially low interest rates that fuel a credit boom and poor investments, followed by a bust when those investments prove unsustainable.

In practice, specific cycles have been triggered by a mix of events, including oil price shocks, financial crises, tight monetary policy and, in 2020, a pandemic.

Limitations of the Economic Cycle

The model describes a pattern; it does not forecast it. Its main limits:

• Turning points are known only in hindsight, and real-time data are often revised.
• Cycle length is irregular, so the average says nothing about how long the current phase will last.
• Stages are not uniform. Some industries, regions or countries can be contracting while others grow, even though global shocks can synchronize them.
• Indicators can send mixed signals. Employment, output and inflation do not always move together, which makes the current stage debatable.

Distinctions Readers Often Confuse

Contraction vs. recession. Contraction is the stage of falling activity. A recession is a contraction that is significant, broad and lasts more than a few months. A brief, shallow dip may be a slowdown without being a recession.

Two negative quarters vs. the official definition. Two or more consecutive quarters of rising GDP are often used as shorthand for expansion, and two consecutive quarters of falling GDP as shorthand for recession. These are rules of thumb. The NBER does not use them as its definition and weighs a wider set of indicators.

Classical cycle, growth cycle and growth rate cycle. A classical cycle tracks rises and falls in the level of activity. A growth cycle tracks movements above and below the economy’s long-run trend. A growth rate cycle tracks speedups and slowdowns in the rate of growth. An economy can be in a growth rate slowdown while its output level is still rising.

Cyclical vs. natural unemployment. The cycle drives cyclical unemployment, which rises in contractions and falls in expansions. The natural rate of unemployment reflects frictional and structural factors and is defined independently of the cycle, although economists debate whether long, deep recessions can push it higher over time.

The Bottom Line

The economic cycle matters to policymakers, investors and businesses whose results rise and fall with the broader economy. Since turning points are confirmed only in hindsight and cycle length is irregular, the model works best as a framework for reading several indicators together. It cannot predict when the current phase will end, though it can guide choices on interest rates, sector exposure, inventory and cash reserves.