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| Business cycle model | a model showing the increases and decreases of a nation's real GDP over time, this model typically demonstrates an increase in real GDP over the long run, combined with short-run fluctuations in output |
| Expansion | the phase of the business cycle during which output is increasing |
| Recession | the phase of business cycle during which output is falling |
| Depression | a deep and prolonged recession |
| Peak | the turning point in the business cycle between an expansion ans a contraction; during a peak in the business cycle, output has stopped increasing ans begins to decrease |
| trough | the turning point in the business cycle between a recession and a expansion; during a trough in the business cycle, output that had been falling during the recession stage of the business cycle bottoms out and begins to increase again |
| recovery | when GDP begins to increase following a contraction and a trough in the business cycle; an economy is considered in recovery intil real GDP returns to its long-run potential level |
| potential output | the level of output an economy can achieve when it is producing at full employment; when an economy is producing at its potential output, it experiences only its natural rate ot unemployment, no more and no less |
| Growth trend | the straight line in the business cycle model, which is usually upward-sloping and shows the long-run pattern of change in real GDP overtime |
| positive output gap | the difference between actual output and potential output when an economy is producing less than full empm output; when there is a Pog, the rate of unemployment is less than the ntural rate of unemployment and an economy is operating outside of its PPC |
| Negative output gap | the difference between actual output and potential output when can economy is producing less than full employment output; when there is a NOG, the rate of unemployment is > than the natual rate of unemployment ans an economy is operating inside its PPC |