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Economics: SL Revision Notes

SL IB Economics

Revision Notes

Home / IB / Economics / SL / Revision Notes / 2. Microeconomics / 2.9 Market Failure: Public Goods / 2.9.1 Public Goods


2.9.1 Public Goods


Characteristics of Public Goods

  • A public good is substantially different to a private good

  • Private goods are goods which firms are able to provide to generate profits. They can generate profits as these goods are excludable and rivalrous
    • The firm is able to exclude certain customers from purchasing their goods through the use of the price mechanism. If customers cannot afford to buy them, then they are excluded
    • Customers can also compete for these goods which are limited in supply and this rivalry helps to generate profits for firms
  • Public goods are goods that are beneficial to society (e.g. roads, parks, lighthouses, national defence) but which will not be provided by private firms due to the principles of non-excludability and non-rivalry 
    • Non-excludability refers to the inability of private firms to exclude certain customers from using their products. In effect, the price mechanism cannot be used to exclude customers e.g. street lighting
    • Non-rivalry refers to the inability of the product to be used up, so there is no competitive rivalry in consumption to drive up prices and generate profits for firms
    • Therefore, governments will often provide these beneficial goods themselves, and so they are called public goods

  • If firms decided to provide these goods anyway, it would give rise to what is called the ‘free rider’ problem
    • This is a situation where customers realise that they can still access the goods, even without paying for them
    • If they are paying, they stop and continue to enjoy the benefits. They are ‘free-riding’ on the backs of other paying customers
    • Over time, any customers who are paying for the goods will stop
    • At some point firms will cease to provide these goods and they will become under-provided in society

Exam Tip

Make sure that you know the difference between public goods and merit goods. The key idea is that private firms will not provide public goods, so under-provision (or no provision) occurs in society.

On the other hand, private firms will provide some merit goods as they are able to make a profit from them. However, due to the profit incentive and high prices that firms charge, not all members of society will be able to afford these goods. So merit goods are also under-provided, but there is some provision for them.

Government Intervention in Response to Public Goods

  • Governments have three possible responses to the under-provision of public goods
  1. Do nothing:  no provision is offered
  2. Provide the good/service themselves e.g. libraries, parks
  3. Contract out: accept bids from private companies who wish to provide the good/service, choose the lowest priced bid and pay the company to provide the good/service 
  • Both option 2 and 3 require the provision to be paid for by governments
    • There is an opportunity cost to any funding decision

Exam Tip

Government provision is an excellent way to address inequality in society. More government provision usually reduces inequality and less government provision usually increases inequality. Government provision often increases when an economy is booming and reduces when an economy is in recession or struggling. 



  • 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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