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SL IB Economics

Revision Notes

Home / IB / Economics / SL / Revision Notes / 3. Macroeconomics / 3.2 Variations in Economic Activity (AD & AS) / 3.2.4 Shifts of the Long-Run Aggregate Supply (LRAS)


3.2.4 Shifts of the Long-Run Aggregate Supply (LRAS)


Factors that Shift the LRAS

  • Classical economists believe that the long-run aggregate supply (LRAS) can increase in the long-run
  • Keynesian economists believe that aggregate supply can increase in the long-term
      
  • The following factors will shift the entire Classical LRAS curve, or the Keynesian AS curve outwards, thus increasing the potential output of the economy. This corresponds to an outward or inward shift on the production possibilities curve for an economy
  1. Changes in the quality or quantity of the factors of production: Any factor that increases the quantity or quality of a factor of production will increase the productive potential of an economy e.g. improving the skills of workers or changing the migration policies so that there is an increase the quantity of labour
  2. Technological advances: these often improve the quality of the factors of production e.g. development of metal alloys
  3. Efficiency improvements: process innovation often results in productivity improvement e.g. moving from labour intensive car production to automated car production
  4. Changes in institutions: increasing financial institutions can result in more access to finance and help to increase the potential supply. Creating and implementing new legislation (laws) can make it easier for new firms to enter markets thus increasing supply e.g. implementation of competition policy

Exam Tip

You will frequently be examined on your understanding of factors that shift the short-run aggregate supply (SRAS) curve and long-run aggregate supply (LRAS) curve.

Make sure you know the difference and remember that LRAS factors will shift the entire LRAS curve to the right, representing an increase in the potential output of the economy. Changes to SRAS do not change the potential output of the economy.

Diagrammatic Illustration of Long-run Shifts

1. Changes to LRAS in the Classical Model

  • Changes to any of the determinants of LRAS will change the long-run productive potential of the economy

e7gx3Fto_2-4-3---changes-to--lras---classical

The Classical view of an increase in the long-run aggregate supply (LRAS) of an economy leading to lower average price levels

 

Diagram Analysis

  • The initial potential output of this economy is seen at YFE
    • The economy is in equilibrium at AP1YFE

  • A change to the education level in the economy can increase the quality of labour and shift the LRAS to the right from LRAS1→LRAS2
    • There is now an increased level of potential output in the economy at YFE1

  • The extra supply in the economy allows prices to fall and output to increase resulting in a new equilibrium at AP2YFE1
     

2. Changes to AS in the Keynesian Model

  • As with the Classical model, changes to any of the determinants of AS will change the long term productive potential of the economy

3-2-4---changes-to-as-in-the-keynesian-model-1

The Keynesian view of an increase in the long-term aggregate supply (LRAS) of an economy

 

Diagram Analysis

  • The initial potential output of this economy is seen at YFE
  • A change to the immigration policy can increase the quantity of labour and shift the AS to the right from AS1→AS2
    • There is now an increased level of possible output in the economy YFE1



  • 1. Introduction To Economics
    • 1.1 What Is Economics?
      • 1.1.1 Economics as a Social Science
        • 1.1.2 The Problem of Choice
          • 1.1.3 The Production Possibilities Curve Model (PPC)
            • 1.1.4 Modelling the Economy
            • 1.2 How Do Economists Approach The World?
              • 1.2.1 Economic Methodology
                • 1.2.2 Economic Thought
              • 2. Microeconomics
                • 2.1 Demand
                  • 2.1.1 Demand, Price & Quantity
                    • 2.1.2 Non-Price Determinants of Demand
                    • 2.2 Supply
                      • 2.2.1 Supply, Price & Quantity
                        • 2.2.2 Non-Price Determinants of Supply
                        • 2.3 Competitive Market Equilibrium
                          • 2.3.1 Market Equilibrium & Disequilibrium
                            • 2.3.2 Functions of the Price Mechanism
                              • 2.3.3 Consumer & Producer Surplus
                              • 2.4 Price Elasticity of Demand (PED)
                                • 2.4.1 Definition, Calculation & Determinants of PED
                                  • 2.4.2 The Significance of PED
                                  • 2.5 Income Elasticity of Demand (YED)
                                    • 2.5.1 Definition, Calculation & Illustration of YED
                                    • 2.6 Price Elasticity of Supply (PES)
                                      • 2.6.1 Definition, Calculation & Determinants of PES
                                      • 2.7 Role of Government In Microeconomics
                                        • 2.7.1 Reasons For Government Intervention In Markets
                                          • 2.7.2 Government Intervention: Indirect Taxes & Subsidies
                                            • 2.7.3 Government Intervention: Price Controls, Direct Provision & Regulation
                                            • 2.8 Market Failure: Externalities & Common Pool (Access) Resources
                                              • 2.8.1 Market Failure
                                                • 2.8.2 Negative Externalities
                                                  • 2.8.3 Positive Externalities
                                                    • 2.8.4 Common Pool (Access) Resources
                                                      • 2.8.5 Government Intervention to Address the Market Failure
                                                        • 2.8.6 Other Interventions to Address the Market Failure
                                                        • 2.9 Market Failure: Public Goods
                                                          • 2.9.1 Public Goods
                                                        • 3. Macroeconomics
                                                          • 3.1 Measuring Economic Activity
                                                            • 3.1.1 National Income & The Circular Flow of Income
                                                              • 3.1.2 National Income Terminology & Calculations
                                                                • 3.1.3 The Business Cycle
                                                                  • 3.1.4 Appropriateness of Using GDP/GNI to Measure Well-being
                                                                    • 3.1.5 Alternative Measures of Well-Being
                                                                    • 3.2 Variations in Economic Activity (AD & AS)
                                                                      • 3.2.1 Aggregate Demand (AD)
                                                                        • 3.2.2 Short-Run Aggregate Supply (SRAS)
                                                                          • 3.2.3 Alternative Views of Aggregate Supply (AS)
                                                                            • 3.2.4 Shifts of the Long-Run Aggregate Supply (LRAS)
                                                                              • 3.2.5 Macroeconomic Equilibrium
                                                                              • 3.3 Macroeconomic Objectives
                                                                                • 3.3.1 An Introduction to Macroeconomic Objectives
                                                                                  • 3.3.2 Economic Growth
                                                                                    • 3.3.3 Low Unemployment
                                                                                      • 3.3.4 Low & Stable Rate of Inflation
                                                                                        • 3.3.5 Potential Conflicts Between Macroeconomic Objectives
                                                                                        • 3.4 Inequality & Poverty
                                                                                          • 3.4.1 Measuring Inequality & Poverty
                                                                                            • 3.4.2 Causes of Inequality & Poverty
                                                                                              • 3.4.3 Using Taxation to Reduce Inequality & Poverty
                                                                                                • 3.4.4 Other Policies to Reduce Inequality & Poverty
                                                                                                • 3.5 Demand Management: Monetary Policy
                                                                                                  • 3.5.1 An Overview of Monetary Policy
                                                                                                  • 3.6 Demand Management: Fiscal Policy
                                                                                                    • 3.6.1 An Overview of Fiscal Policy
                                                                                                    • 3.7 Supply-Side Policies
                                                                                                      • 3.7.1 An Overview of Supply-Side Policies
                                                                                                        • 3.7.2 The Effectiveness of Supply-Side Policies
                                                                                                      • 4. The Global Economy
                                                                                                        • 4.1 Benefits of International Trade
                                                                                                          • 4.1.1 The Advantages of Free Trade
                                                                                                          • 4.2 Types of Trade Protection
                                                                                                            • 4.2.1 Tariffs
                                                                                                              • 4.2.2 Quotas
                                                                                                                • 4.2.3 Export Subsidies
                                                                                                                  • 4.2.4 Administrative Barriers
                                                                                                                  • 4.3 Arguments For & Against Trade Protection
                                                                                                                    • 4.3.1 Arguments For & Against Trade Protection
                                                                                                                    • 4.4 Economic Integration
                                                                                                                      • 4.4.1 Understanding Economic Integration
                                                                                                                        • 4.4.2 Types of Trading Blocs
                                                                                                                          • 4.4.3 The World Trade Organisation (WTO)
                                                                                                                          • 4.5 Exchange Rates
                                                                                                                            • 4.5.1 Types of Exchange Rate Systems
                                                                                                                              • 4.5.2 Causes & Consequences of Exchange Rate Fluctuations
                                                                                                                              • 4.6 Balance of Payments
                                                                                                                                • 4.6.1 Components of the Balance of Payments
                                                                                                                                • 4.7 Sustainable Development
                                                                                                                                  • 4.7.1 The Sustainable Development Goals
                                                                                                                                  • 4.8 Measuring Economic Development
                                                                                                                                    • 4.8.1 Single Indicators of Development
                                                                                                                                      • 4.8.2 Composite Indicators of Development
                                                                                                                                        • 4.8.3 Evaluating the Different Approaches
                                                                                                                                        • 4.9 Barriers to Economic Growth & Development
                                                                                                                                          • 4.9.1 Poverty Traps
                                                                                                                                            • 4.9.2 Economic, Political & Social Barriers
                                                                                                                                            • 4.10 Economic Growth & Development Strategies
                                                                                                                                              • 4.10.1 Trade Strategies, Diversification & Social Enterprise
                                                                                                                                                • 4.10.2 Market-Based & Interventionist Policies
                                                                                                                                                  • 4.10.3 Merit Goods & Inward Foreign Direct Investment
                                                                                                                                                    • 4.10.4 Foreign Aid & Development Assistance
                                                                                                                                                      • 4.10.5 Institutional Change
                                                                                                                                                        • 4.10.6 Evaluating Market Orientated Approaches Versus Government Intervention
                                                                                                                                                          • 4.10.7 Progress Towards Sustainable Development Goals

                                                                                                                                                        Author: Steve



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