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May 29, 2020 

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ADJUSTMENT, SHORT-RUN AGGREGATE MARKET: Disequilibrium in the short-run aggregate market induces changes in the price level that restore equilibrium. If the price level is above the short-run equilibrium price level, economy-wide product market surpluses cause the price level to fall. If the price level is below the short-run equilibrium price level, economy-wide product market shortages cause the price level to rise. In both cases short-run equilibrium is restored. You might want to compare adjustment, long-run aggregate market. Price level changes induce changes in both aggregate expenditures and real production. Unlike the long-run aggregate market, changes in the price level can induce changes in short-run aggregate supply, making it greater or less than full-employment real production.

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PEAK:

The transition of a business-cycle expansion to a business-cycle contraction. The end of an expansion carries this descriptive term of peak, or the highest level of economic reached in recent times. A peak is one of two turning points. The other, the transition from contraction to expansion, is a trough. Turning points are important because they represent the transition from bad to good or good to bad.
A business-cycle peak means the economy has reached the highest level of production in recent times. Unfortunately, because a peak is a turning point, it means that a contraction is beginning. Even though a peak is the "highest," this is not something that the economy actually wants. Ideally, a peak is never reached and the economy continues to expand.

A Graphical Pinnacle

The Highest Turning Point
Business Cycle
The diagram at the right presents a simple business cycle. The red line represents the value of real gross domestic product (real GDP) over a period of several months. The blue line is potential real GDP, the amount of real GDP that the economy can produce by fully employing all resources. A business-cycle expansion is indicated as the increase in real GDP from point B to point C.

While expansions are generally good, unfortunately they do not last forever. At least none have so far. There is always hope that the "current" expansion will not end. And people sometimes euphorically think that it will not. But so far every expansion, save for the "current" one, has ended. A click of the [Peak] button highlights the business cycle peak at point C which ends the expansion displayed here.

A Bit of Inflation?

If the peak of a business cycle lies above the long-run trend, the prospect of higher inflation emerges. Because the long-run trend represents full employment, when real GDP exceeds the potential real GDP, then the economy is trying to produce more than it can sustain in the long run. The result is higher prices and inflation. Inflation tends to be most pronounced near the peak. In fact, rising inflationary pressures often contribute to the end of the expansion and the onset of a contraction, especially if the government sector fights inflation with contractionary stabilization policies.

Tracking the Numbers

Like other aspects of business cycles, a peak is officially identified by the official business-cycle watchers at the National Bureau of Economic Research. Inevitably an official peak is only officially designated a year or two after the fact, once all of the relevant data have been processed and analyzed.

While knowing when a peak did occur is useful information, anticipating when one will occur is even better. Knowing when the current expansion will end and the next contraction will begin makes it possible to plan for the ensuing bad times. Workers, especially those most likely to be unemployed, can be helped by anticipating a peak. So too can businesses that are seeking to avoid lost profits or even bankruptcy. Forecasting a peak is perhaps most useful for government leaders who can implement timely policies that might actually avoid the peak and ensuing contraction entirely.

Forecasting upcoming peaks is commonly attempted using leading economic indicators, a series of ten economic statistics that tend to reach their "peak" three to twelve months before the actual business cycle. More sophisticated forecasts are also provided by complex mathematical models of the economy.

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Recommended Citation:

PEAK, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2020. [Accessed: May 29, 2020].


Check Out These Related Terms...

     | business cycles | business cycle phases | expansion | contraction | trough | recovery | recession | potential real gross domestic product | long-run trend |


Or For A Little Background...

     | full employment | macroeconomics | macroeconomic goals | mixed economy | economic analysis | production possibilities | efficiency | model |


And For Further Study...

     | business cycle indicators | investment business cycles | political business cycles | demand-driven business cycles | supply-driven business cycles | stabilization policies | inflation | unemployment |


Related Websites (Will Open in New Window)...

     | National Bureau of Economic Research | The Conference Board |


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