Lesson 9.2: Aggregate Supply: Short Run and Long Run

Introduction

Welcome to Lesson 9.2, where we will explore the fascinating world of aggregate supply! 🌍 In this lesson, we will uncover the key concepts surrounding the short-run and long-run aggregate supply curves, how they operate, and what factors can shift them.

Learning Objectives

By the end of this lesson, students will be able to:

• Understand the short-run aggregate supply (SRAS) curve and identify the factors that shift it, including costs, wages, taxes, and supply shocks.
• Differentiate between the short-run aggregate supply and long-run aggregate supply (LRAS) curves, and comprehend the differences in the Keynesian and classical views.
• Explain the determinants of LRAS, including the quantity and quality of factors of production.
• Recognize the relationship between LRAS and the economy's productive potential, revisiting the production possibilities frontier (PPF).
• Distinguish movements along supply curves from shifts of each curve.

Understanding Short-Run Aggregate Supply (SRAS)

The short-run aggregate supply curve represents the total supply of goods and services that businesses are willing to produce at a given price level, and it is upward sloping. This means that as the price level increases, the total quantity of goods and services supplied increases. 📈

Factors That Shift the SRAS Curve

Several factors can cause the SRAS curve to shift, including:

1. Costs of Production: If the cost of raw materials or other inputs rises, it may lead to a leftward shift of the SRAS curve. For example, if the price of oil increases, transportation costs may rise, making it more expensive for businesses to produce goods.
2. Wages: When wages increase, production becomes more costly, shifting the SRAS curve to the left. Conversely, if wages fall, the curve shifts to the right.
3. Taxes: Higher business taxes can decrease profit margins for firms, causing a leftward shift in SRAS. Meanwhile, tax cuts can lead to an increase in supply.
4. Supply Shocks: Events like natural disasters or geopolitical tensions can dramatically affect the ability of a sector to produce, resulting in shifts of the SRAS curve.

Example of SRAS Shift

Imagine a factory that produces smartphones. If a critical component, like microchips, sees a sudden price increase due to scarcity, the factory’s cost of production rises. This cost increase will shift the SRAS curve to the left, indicating that at the same price level, the quantity of smartphones available for sale decreases. 📱

Exploring Long-Run Aggregate Supply (LRAS)

The long-run aggregate supply curve, in contrast, is vertical. It reflects the total output an economy can produce when utilizing its resources fully and efficiently, independent of price levels. This vertical nature signifies that in the long run, the economy is at its full employment level, regardless of inflation or deflation.

Difference Between Keynesian and Classical Views

• Keynesian View: Keynesians believe that the economy can remain below its full potential for a long time due to persistent demand deficiencies. They argue that policy interventions can help adjust the economy back to its full potential.
• Classical View: Classical economists argue that the economy naturally moves towards full employment in the long run and that supply-side factors primarily determine growth. They emphasize that the LRAS will not be influenced by price levels.

Determinants of LRAS

The long-run aggregate supply depends on:

1. Quantity of Factors of Production: The amount of labor, capital, and resources available can shift the LRAS curve. More workers or improved technology can lead to a rightward shift of the LRAS as more goods can be produced.
2. Quality of Factors: The skill level of labor, the efficiency of capital, and overall productivity improvements (like advancements in technology) also play significant roles. For instance, better training for workers or new production techniques can increase the economy's productive potential.

Connection Between LRAS and Productive Potential

The LRAS curve corresponds to the economy's production possibilities frontier (PPF). The PPF illustrates the maximum possible output combinations of two goods given available resources. As resources become more efficiently and effectively utilized, the LRAS shifts to the right, indicating that the economy can produce more.

Movements Along vs. Shifts of the Supply Curves

Understanding the difference between movements along the supply curves and shifts is crucial:

• Movements Along the Curves: These occur due to a change in the price level, affecting the quantity supplied. For example, if the price of oil rises, firms might supply more oil, moving along the SRAS curve to the right.
• Shifts of the Curves: These result from factors changing other than the price level, such as wage increases, tax changes, or supply shocks, which result in an entirely new curve.

Conclusion

In this lesson, students explored the key components of the short-run and long-run aggregate supply. You learned about how various factors can shift the SRAS and LRAS curves, the differences in economic viewpoints, and what determines the productive capacity of an economy. This foundation in aggregate supply sets the stage for a deeper understanding of how economies function!

Study Notes

• The SRAS curve is upward sloping.
• Factors shifting SRAS: costs of production, wages, taxes, and supply shocks.
• The LRAS curve is vertical, indicating potential output regardless of price.
• Keynesians believe in persistent demand deficiencies; classical economists emphasize natural full employment.
• LRAS determinants: quantity and quality of factors of production.
• PPF represents the economy's productive potential, linked to LRAS.
• Movements along supply curves occur due to price changes; shifts occur due to external factors.