Long-Run Aggregate Supply

Definition

Long-run aggregate supply (LRAS) refers to the total quantity of output that an economy can produce when all factors of production, including capital, labor, and technology, are fully utilized. It represents the economy's potential output or the maximum level of real GDP that can be sustained in the long run without inflationary pressures.

5 Must Know Facts For Your Next Test

1. The long-run aggregate supply curve is vertical, indicating that real GDP is determined by the economy's productive capacity and is independent of the price level in the long run.
2. The position of the LRAS curve is determined by factors such as the size and quality of the labor force, the stock of capital and natural resources, and the level of technology.
3. Increases in the quantity or quality of factors of production, or improvements in technology, will shift the LRAS curve to the right, indicating a higher potential output.
4. The LRAS curve is relevant in the context of income inequality, as it represents the maximum level of output that can be produced and distributed among the population.
5. In Keynesian analysis, the LRAS curve is assumed to be horizontal, implying that the economy can produce at any level of output without inflationary pressures.

Review Questions

• Explain how the long-run aggregate supply (LRAS) curve is different from the short-run aggregate supply (SRAS) curve.
  • The key difference between the LRAS and SRAS curves is the time horizon. The LRAS curve is vertical, indicating that real GDP is determined by the economy's productive capacity and is independent of the price level in the long run. In contrast, the SRAS curve is upward-sloping, reflecting the fact that firms are willing to produce more output at higher price levels in the short run, when at least one factor of production is fixed. The position of the LRAS curve is determined by the size and quality of the labor force, the stock of capital and natural resources, and the level of technology, while the SRAS curve is influenced by factors such as input prices and expectations.
• Analyze the role of the LRAS curve in the Keynesian model of aggregate demand and aggregate supply.
  • In the Keynesian analysis, the LRAS curve is assumed to be horizontal, implying that the economy can produce at any level of output without inflationary pressures. This is because Keynesians believe that the economy may not always be at full employment, and that government intervention through fiscal and monetary policies can be used to stimulate aggregate demand and move the economy towards its potential output. The horizontal LRAS curve means that changes in aggregate demand will affect the level of real GDP, rather than just the price level. This contrasts with the neoclassical view, where the LRAS curve is vertical, and changes in aggregate demand will primarily affect the price level in the long run.
• Evaluate how changes in the factors of production and technological progress can impact the position of the LRAS curve and the economy's potential output.
  • Increases in the quantity or quality of factors of production, such as the size and skill level of the labor force, the stock of capital, and the availability of natural resources, will shift the LRAS curve to the right, indicating a higher potential output. Similarly, improvements in technology, such as advancements in production methods or the development of new products, will also shift the LRAS curve to the right. These changes in the economy's productive capacity will allow the economy to produce more output without inflationary pressures, which can have important implications for income distribution and the standard of living. Policymakers may use this understanding of the LRAS curve to implement policies that promote the growth of factors of production and technological progress, in order to expand the economy's potential output and improve economic well-being.

Related terms

Aggregate Supply:

Aggregate supply is the total quantity of goods and services that firms are willing to sell at different price levels in an economy.

Short-Run Aggregate Supply:

Short-run aggregate supply (SRAS) represents the total quantity of output that firms are willing to produce and sell at different price levels in the short run, when at least one factor of production is fixed.

Potential GDP:

Potential GDP is the level of real GDP that an economy can produce when all resources are fully employed, without causing inflation to rise.