Microeconomics Study Notes: Market Failures, Public Goods, and the Public Sector (ECON1110, Chapter 5)

Chapter 5: Market Failures and the Public Sector

Objectives

• Understand how market failures such as externalities might justify economic functions of government.

• Distinguish between private goods and public goods and explain the nature of the free rider problem.

• Describe economic and political functions of government that entail its involvement in markets.

• Analyze how public spending programs such as Medicare affect consumption incentives.

• Differentiate between average tax rates and marginal tax rates.

Market Failures and Externalities

Introduction to Market Failures

Market failures occur when the allocation of resources by a free market is not efficient, often leading to overproduction or underproduction of certain goods or services. These failures justify government intervention to improve outcomes.

• Consumer sovereignty: Consumers are free to buy what they want.

• Competition: Provides choices and prevents prices from being too high.

• However, sometimes the price system misallocates resources, leading to market failures.

Externalities

Externalities are costs or benefits from an economic activity that affect third parties not directly involved in the transaction. They can be negative (external costs) or positive (external benefits).

• Negative externalities: Market overallocates resources (overproduction).

• Positive externalities: Market underallocates resources (underproduction).

When the price paid for a good does not reflect its true opportunity cost to society, externalities result in resource misallocation.

Negative Externality Example: Pollution

Consider a steel mill that emits pollution:

• The steel mill does not pay the full cost of production, ignoring the cost of dirtying the air for nearby residents.

• This leads to overproduction of steel, as the market price does not include external costs.

Graphical Analysis:

• Market equilibrium without external costs: $Q_1$ at price $P_1$.

• Socially optimal equilibrium (including external costs): $Q_2$ at price $P_2$.

• Overproduction occurs: $Q_1 > Q_2$.

Positive Externality Example: Vaccination

Vaccines provide private benefits (protection from disease) and external benefits (herd immunity). The market may underproduce vaccines because individuals do not consider the external benefits to society.

• Equilibrium quantity without external benefits: $Q_1$.

• Socially optimal quantity (including external benefits): $Q_2$.

• Underproduction occurs: $Q_1 < Q_2$.

Government Solutions to Externalities

• For negative externalities:

  • Impose taxes equal to the external cost ("pollution tax").

  • Regulate maximum allowable pollution levels.

  • Require pollution abatement equipment.

  • Issue tradable pollution permits.

• For positive externalities:

  • Subsidize production or consumption.

  • Government provision of goods/services.

  • Mandate certain actions (e.g., vaccination requirements).

Other Economic Functions of Government

Legal System

Governments establish legal rules of behavior, enforce contracts, settle disputes, and protect property rights. Well-defined property rights encourage efficient use and maintenance of resources.

Promoting Competition

Governments protect competitive markets by passing antitrust laws to prevent monopolies and regulate anti-competitive practices. Competition ensures economic efficiency and consumer choice.

Provision of Public Goods

Goods are classified based on excludability and rivalry:

Type	Excludable	Rivalrous	Examples	Economic Issues
Private Goods	Yes	Yes	Food, clothing, cars	No major efficiency issue
Public Goods	No	No	National defense, public parks, lighthouses	Free rider problem; private market cannot efficiently produce
Common Resources	No	Yes	Fish stocks, forests, fresh water	Overuse ("tragedy of the commons")

Free rider problem: Occurs when individuals benefit from a good without paying for it, leading to underprovision by the private sector.

Ensuring Economy-Wide Stability

Governments use fiscal and monetary policy to stabilize the economy during periods of unemployment or inflation. This is more fully explored in macroeconomics.

Political Functions of Government

Influencing Consumption Choices

• Merit goods: Deemed socially desirable (e.g., museums, affordable housing). Government may subsidize or provide these goods.

• Demerit goods: Deemed socially undesirable (e.g., alcohol, tobacco). Government may restrict or tax these goods.

Redistribution of Income

• Income tax: Progressive tax system where higher incomes pay a higher percentage.

• Transfer payments: Government payments to individuals (e.g., welfare, disability benefits) without goods/services rendered.

• In-kind transfers: Provision of services (e.g., health care, subsidized housing).

Public Spending and Transfer Programs

Government Expenditure

Government spending includes expenditures on employees, infrastructure, welfare, and health care. Health-related spending is a significant portion of total government outlays.

• Medicare: Canada's publicly funded health care system, managed by provinces/territories, with federal standards.

• Increasing demand and costs for health care are addressed through government funding and non-price rationing (e.g., wait times).

Economics of Wait Times

When health care is subsidized, demand exceeds supply at the subsidized price, resulting in shortages and increased wait times. Non-price rationing occurs when price signals are removed.

Taxation in the Public Sector

Government Budget Constraint

Government spending must be funded by taxes or user charges. The budget constraint is:

• Every dollar spent by the government must be matched by revenue.

Tax Bases and Tax Rates

• Tax base: The value of goods, services, wealth, or income subject to taxation.

• Marginal tax rate: The rate applied to the next dollar of taxable income.

• Average tax rate: Total tax paid divided by total taxable income.

Formulas:

• Marginal tax rate: $\text{Marginal Tax Rate} = \frac{\Delta \text{Tax Paid}}{\Delta \text{Taxable Income}}$

• Average tax rate: $\text{Average Tax Rate} = \frac{\text{Total Tax Paid}}{\text{Total Taxable Income}}$

Tax Rate Examples

Consider a progressive tax system with brackets:

Taxable Income	Tax Rate
$0 - $43,953	15%
$43,954 - $87,907	22%
$87,908 - $125,000	26%

Example 1: Taxable income = $52,000

• Marginal tax rate: 22%

• Average tax rate: $16.08\% = \frac{8,363.29}{52,000}$

Example 2: Taxable income = $125,000

• Marginal tax rate: 26%

• Average tax rate: $20.73\% = \frac{25,907.01}{125,000}$

Types of Taxation

• Proportional tax: Same percentage of income paid at all income levels.

• Progressive tax: Higher percentage paid as income increases.

• Regressive tax: Lower percentage paid as income increases; often applies to sales taxes.

Summary Table: Tax Systems

Type	Marginal Tax Rate	Average Tax Rate	Example
Proportional	Constant	Constant	Flat income tax
Progressive	Increases with income	Increases with income	Canadian federal income tax
Regressive	Decreases with income	Decreases with income	Sales tax

Key Terms

• Market failure: Inefficient allocation of resources by the market.

• Externality: Cost or benefit affecting third parties.

• Public good: Non-excludable and non-rivalrous good.

• Free rider problem: Individuals benefit without paying.

• Marginal tax rate: Tax rate on the next dollar earned.

• Average tax rate: Total tax divided by total income.

Example Applications

• Pollution taxes reduce negative externalities.

• Subsidies for vaccines increase positive externalities.

• Progressive taxes redistribute income.

Additional info: Some context and definitions have been expanded for clarity and completeness, including the summary tables and formulas.