Updated for the 2026 CFA® Level I curriculum.
The business cycle describes how aggregate economic activity moves above and below its long-term growth path. CFA Level I tests whether you can identify which phase a fact pattern describes and whether you can tell a phase from the turning point that starts or ends it. This note covers the four phases in order, the direction of activity within each, and the signals that separate genuine turning points from noise.
Quick Answer
The business cycle is the recurring pattern of expansion and contraction in aggregate economic activity around a long-term trend. It has four phases: expansion, peak, contraction, and trough. Expansion and contraction are phases. Peak and trough are turning points, not phases themselves. Output, employment, income, and spending rise during expansion and fall during contraction. Cycles repeat, but their length and severity vary each time.
Key Takeaways
The business cycle moves through four phases in a fixed order: expansion, peak, contraction, trough.
Peak and trough are turning points. They mark the moment a phase ends, not periods with their own sustained direction.
Expansion means broad measures of output, employment, income, and sales are rising. Contraction means those measures are falling.
Recovery is the early part of expansion, starting from the trough. It is not a fifth independent phase.
Identifying a phase from a vignette requires weighing several signals together, not relying on one data point.
Business cycles are recurrent but not periodic. Length and severity differ from one cycle to the next.
Credit conditions and specific indicator classifications support phase identification but belong on separate notes.
What You Need to Know for CFA Level I
Recognize expansion, peak, contraction, and trough from a short economic description.
Separate a phase (a duration with a direction) from a turning point (a single moment of change in direction).
Treat output and employment changes as identification clues, not as formal proof on their own.
Remember that cycles recur but do not follow a fixed calendar length.
Keep leading, coincident, and lagging indicator detail off this page. That detail belongs on the Economic Indicators note.
How the Business Cycle Moves
Economic activity does not grow in a straight line. Real GDP tends to rise over long periods, but it moves above and below that trend line in a repeating pattern. This pattern is the business cycle.
Four terms describe the sequence:
Expansion. Aggregate activity rises. Output, employment, income, and sales increase together.
Peak. Activity stops rising and turns down. This is a turning point, not a phase with its own duration.
Contraction. Aggregate activity falls. This phase is also called a recession when the decline is significant and broad.
Trough. Activity stops falling and turns up. This is a turning point that ends the contraction.
After the trough, the cycle enters expansion again. The early part of this new expansion is often called recovery, the stretch where activity is rising but has not yet returned to its prior peak level. Recovery is a descriptive label for early expansion, not a separate phase with independent characteristics.
The cycle is recurrent. Every full cycle eventually returns to expansion. It is not periodic. One cycle might run two years, the next might run seven. Depth and speed of contraction vary as much as duration does. Candidates should resist any instinct to memorize a "typical" cycle length, because the curriculum does not support one.
What Happens in Each Business Cycle Phase
Each phase has a consistent direction across the broad measures of economic activity. The table below summarizes the pattern candidates need for identification questions.
Measure | Expansion | Contraction |
|---|---|---|
Output (real GDP) | Rising | Falling |
Employment | Rising, often with a lag | Falling, often with a lag |
Income | Rising | Falling |
Sales and spending | Rising | Falling |
Business investment | Rising | Falling, often sharply near the start |
Confidence (business and consumer) | Improving | Deteriorating |
Two caveats matter for exam questions.
First, employment usually turns after output. Firms wait to see if a slowdown is temporary before cutting staff, and they wait to see if an upturn will last before hiring. A vignette showing falling output but still-rising employment can still describe early contraction, not expansion.
Second, no single measure moves in a straight line within a phase. A single weak month of sales inside an expansion does not signal a new phase. The direction of the broad pattern across several measures is what identifies the phase, not one data point in isolation.
Credit availability and specific indicator readings (leading, coincident, lagging) can support this identification. This note treats them only as supporting evidence. Full treatment of credit conditions belongs on Credit Cycles. Full treatment of indicator classification belongs on Economic Indicators Across the Business Cycle.
How to Identify a Turning Point
Turning points are harder to identify in real time than phases already underway. Two errors show up repeatedly in practice questions.
Slowing expansion is not the same as contraction. Growth can decelerate for several quarters while output, employment, and income are still rising. That is still expansion, just at a reduced pace. Contraction requires an actual decline in the broad measures, not merely a slower rate of increase.
Improving contraction is not automatically expansion. A recession can show early signs of stabilizing, such as smaller monthly declines in sales, before the trough is actually reached. The phase is still contraction until the broad measures turn positive.
Because of this, identifying a turning point requires multiple consistent signals across output, employment, income, and sales, not one favorable or unfavorable reading. A single strong jobs report during a contraction does not confirm a trough. A single weak GDP reading during an expansion does not confirm a peak.
Worked Example
Consider a hypothetical economy tracked over four quarters.
Q1. Real GDP growth slows from 3.0% to 1.2%. Employment is still rising. Retail sales growth is positive but weaker than the prior quarter. Business confidence surveys edge down slightly.
Reading: This is still expansion. Growth has decelerated, but output, employment, and sales are all still increasing. No turning point has occurred yet.
Q2. Real GDP falls 0.4%. Employment peaks and then begins to decline the following month, consistent with its typical lag behind output. Retail sales turn negative. Confidence surveys fall sharply.
Reading: The peak occurred between Q1 and Q2, at the point output stopped rising. Q2 itself is the start of contraction. Employment's lagged peak is a supporting signal, not the defining one.
Q3. Real GDP falls another 1.1%. Employment continues to decline. Retail sales remain negative but the pace of decline is smaller than in Q2.
Reading: Still contraction. A smaller decline is not a trough. Multiple measures must turn positive before the phase changes.
Q4. Real GDP rises 0.3%. New orders for capital goods rise for the first time in three quarters. Employment is still falling, consistent with its typical lag.
Reading: The trough occurred between Q3 and Q4. Q4 marks the start of recovery, the early stage of a new expansion. Employment's continued decline does not override the turn in output and new orders, because employment is expected to lag.
Plain-language interpretation: A single quarter's number rarely proves a phase change on its own. The consistent pattern across output, sales, and forward-looking measures like new orders identifies the turning point, while employment confirms it later.
Common Exam Traps
Treating a peak as a period of rapid growth
A peak is a single turning point, not a stretch of strong performance. The strongest growth usually happens well before the peak, during mid-expansion.
Calling any slowdown a contraction
A deceleration in the rate of growth is still expansion as long as the broad measures are still rising. Contraction requires an actual decline.
Assuming cycles have fixed lengths
The curriculum does not support a standard cycle duration. Questions describing "typical" cycle length as a fixed number of years reflect a misconception, not a testable fact.
Using one indicator as conclusive evidence
A single data point, favorable or unfavorable, is not enough to confirm a turning point. Look for agreement across output, employment, income, and sales.
Presenting recovery as a fifth independent phase without explanation
Recovery describes early expansion. Some materials use the term loosely. If a question uses "recovery," read it as the start of a new expansion, not a phase with separate rules.
Practice Question
An economist reviews the following three observations about an economy over the past two quarters:
I. Industrial production has declined for two consecutive quarters. II. The unemployment rate has risen each of the last four months. III. New orders for durable goods rose slightly last month after five months of decline.
Based on this pattern, the economy is most likely in which phase?
Expansion, because new orders have turned positive.
Contraction, with new orders suggesting an approaching trough.
Peak, because industrial production and employment are both weakening.
Correct Answer: B
Explanation: Industrial production has fallen for two quarters and unemployment has risen for four months, both consistent with an ongoing contraction. The uptick in new orders is a single early signal, not proof that a trough has occurred. New orders often turn up before other broad measures, so this observation is consistent with an approaching trough within a continuing contraction, not a completed turn.
Option A. Mistakes one improving data point (new orders) for a completed shift into expansion. Production and employment are still declining, which contradicts an expansion classification.
Option C. Confuses a peak, which is a turning point marking the end of expansion, with an established contraction already underway. Two quarters of declining production is well past a peak, not a description of one.
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FAQs About Business Cycles Phases
What are the phases of the business cycle in order?
The order is expansion, peak, contraction, trough, and then back into a new expansion. Peak and trough are turning points that separate the two directional phases.
Is recovery a separate business-cycle phase?
No. Recovery describes the early part of a new expansion, starting from the trough. It is not a fifth phase with its own independent rules.