Recession vs Trough
Recession and Trough are two The Business Cycle concepts in AP Economics that students often mix up. A recession is a significant decline in economic activity lasting more than a few months. The trough is the lowest point of economic activity in a business cycle. Here is how they compare side by side.
A recession is a period of economic contraction characterized by falling output, rising unemployment, and decreasing income. Recessions are typically identified by a decline in real GDP for at least two consecutive quarters. During a recession, businesses often cut back on production and lay off workers, leading to reduced consumer spending and further economic weakness.
The trough represents the end of a contraction and the beginning of an expansion. At the trough, an economy's real GDP stops decreasing and starts to increase. Unemployment is high, and inflation is typically low.
Recession vs Trough: A Phase of the Cycle and the Point Where It Ends
| Recession | Trough | |
|---|---|---|
| Shape on the cycle diagram | The whole descending stretch running from peak to trough | The single lowest point, where the curve flattens and turns |
| Duration | Months, sometimes longer | A turning point dated to one period |
| What output is doing | Falling | Neither falling any further nor yet rising |
| What comes immediately before | The peak | The recession |
| What comes immediately after | The trough | Expansion, also called recovery |
| Level or movement | A movement, since it says which way activity is heading | A level, since it marks the lowest activity of the cycle |
| What unemployment is doing | Rising through the phase | Near its cycle high, and often still rising for a while afterwards |
Read the two off the same series and the difference becomes obvious
Follow real GDP through six quarters in an illustrative economy: 600 billion dollars, then 585, then 572, then 566, then 572, then 588. The peak is the first quarter at 600 billion dollars, because that is the highest point before the decline. The recession is the stretch covering quarters two, three and four, when output was falling. The trough is quarter four at 566 billion dollars, the lowest reading in the series and the moment the direction changed. Expansion begins in quarter five, when output rises to 572 billion dollars. From peak to trough, output fell by 34 billion dollars, which is about 5.7 percent of the peak. Notice how differently the two words behave. The recession occupies three quarters and answers the question of what was happening. The trough occupies one quarter and answers the question of when it stopped. A student who labels quarter four as the recession has named a point where a phase belongs, and a student who shades quarters two to four as the trough has done the reverse. The phases can be stepped through at /sandbox/business-cycle.
The trough is only visible looking backwards, and the pain outlasts it
Sitting inside quarter four in that series, nobody knows it is the trough. Output has fallen for three quarters and might fall again. Only when the next readings come in, and are later revised, does the low point become identifiable, which is why turning points are dated well after they occur. That gives the trough an odd status: it is the most precisely defined moment of the cycle and the hardest one to recognize while standing in it. It is also worth separating the trough from recovery in any full sense. Reaching the trough means only that the decline has stopped. Output at that point is still far below where it was and further below potential, unemployment is at or near its cycle high, and closing the shortfall requires an extended period of growth rather than a single quarter of it. The economy that has passed its trough is at the bottom of the hole rather than out of it, which is why the trough and the end of hardship are not the same date on any calendar. The rest of the sequence is at /macro/business-cycle.
Frequently asked questions
Is the trough the same as a recession?
No, a recession is the phase during which economic activity is declining, while the trough is the single lowest point at the end of that decline. The recession covers a stretch of time and the trough marks one moment. The trough is the boundary between recession and expansion.
What comes after the trough in the business cycle?
Expansion follows the trough, the phase in which output, employment and income rise again, continuing until the next peak. Expansions are typically longer than contractions. The full sequence runs peak, recession, trough, expansion, and back to a peak.
Does the economy recover as soon as the trough is reached?
No, the trough means only that output has stopped falling, not that lost ground has been made up or that the labor market has healed. Real GDP at the trough is normally well below potential, so a recessionary gap remains open. Unemployment often keeps climbing for a period after the trough before it turns down.
Live Business Cycle graph. Drag the curves, or open the full version.
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