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PRICE ELASTICITY OF SUPPLY: The relative response of a change in quantity supplied to a relative change in price. More specifically the price elasticity of supply can be defined as the percentage change in quantity supplied due to a percentage change in supply price. The price elasticity of supply should be contrasted with the price elasticity of demand.

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EQUILIBRIUM, LONG-RUN AGGREGATE MARKET:

The state of equilibrium that exists in the long-run aggregate market when real aggregate expenditures are equal to full-employment real production with no imbalances to induce changes in the price level or real production. The opposing forces of aggregate demand (the buyers) and long-run aggregate supply (the sellers) exactly offset each other. At the existing price level, the four macroeconomic sectors (household, business, government, and foreign) purchase all of the real production that they seek and producers sell all of the real production that they have.
While the focus of equilibrium in the long-run aggregate market is on balance between real expenditures and real production in the product markets, it also involves simultaneous equilibrium in the aggregated financial and resource markets. Long-run price flexibility ensures that all three aggregate markets are in equilibrium. Long-run equilibrium is one of two macroeconomic equilibrium alternatives found in aggregate market analysis. The other is equilibrium in the short-run aggregate market, which has equilibrium in the product and financial markets, but NOT in the resource markets.

Equilibrium
Long-Run Aggregate Market
Long-Run Equilibrium

The graph to the right can be used to illustrate equilibrium in the long-run aggregate market. First, to set up the graph, the vertical axis measures the price level (GDP price deflator) and the horizontal axis measures real production (real GDP). The negatively-sloped curve, labeled AD, is the aggregate demand curve and the vertical curve, labeled LRAS, is the long-run aggregate supply curve. Long-run equilibrium is the price level and real production obtained at the intersection of the AD and LRAS curves.

Because the LRAS curve is vertical at full-employment real production, long-run equilibrium necessarily occurs at full employment, regardless of shifts in the AD curve or changes in the price level. To demonstrate that long-run equilibrium occurs at the same full-employment level of real production should aggregate demand change, click the [AD Increase] and [AD Decrease] buttons. An increase in aggregate demand leads to a higher price level, but the same level of real production. A decrease in aggregate demand leads to a lower price level, but also the same level of real production.

Long-run aggregate market equilibrium means that there are no economy-wide product market shortages or surpluses. However, this does not necessarily mean that ALL product markets are in equilibrium. A complex economy, like that in the United States, is bound to have shortages in some product markets and surpluses in others, even in long-run equilibrium. As such, prices in some markets rise, while those in other markets fall.

These sorts of imbalances in specific markets reflect the ongoing reallocation of resources at the microeconomic level. What is required for aggregate market equilibrium at the macroeconomic level is that the microeconomic shortages and surpluses cancel out, that rising prices cancel falling prices, that the price level and real production do not change.

By far the most important implication of long-run equilibrium is full employment. Long-run price flexibility ensures that resource markets are in balance, with NO economy-wide shortages or surpluses. In particular, there is no cyclical unemployment or overemployment. Resource market equilibrium is what generates a LRAS curve that is vertical at full-employment real production. And because the LRAS curve is vertical at full-employment real production, long-run equilibrium, the intersection of the AD and LRAS curves, MUST result in full employment. The economy produces NOTHING BUT full-employment real production in the long run.

This implication of long-run full-employment is most important for government policies. If the economy ALWAYS produces full-employment real production in the long run, then no action, no intervention, no stabilization policy, by government is needed. The goal of stabilization policies is to achieve full employment. If the economy is AT full employment, then such policies are unneeded. This lack of need for government policies is warmly embraced by political conservatives and others who prefer a limited role for government in the economy.

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Recommended Citation:

EQUILIBRIUM, LONG-RUN AGGREGATE MARKET, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2019. [Accessed: August 22, 2019].


Check Out These Related Terms...

     | long-run aggregate market | equilibrium, aggregate market | disequilibrium, long-run aggregate market | aggregate market analysis | short-run aggregate market | equilibrium, short-run aggregate market | disequilibrium, short-run aggregate market | disequilibrium, aggregate market |


Or For A Little Background...

     | aggregate demand | aggregate supply | aggregate expenditures | macroeconomic sectors | macroeconomic markets | long-run aggregate supply | short-run aggregate supply | aggregate demand curve | long-run aggregate supply curve | short-run aggregate supply curve | price level | GDP price deflator | real gross domestic product | equilibrium | full employment | unemployment |


And For Further Study...

     | output gaps | recessionary gap | inflationary gap | aggregate market shocks | self correction, aggregate market | Keynesian economics | monetary economics | classical economics | stabilization policies |


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