Microeconomics Study Guide: Externalities, Resource Markets, and Taxation

Externalities and Economic Efficiency

Definition and Types of Externalities

Externalities occur when the actions of individuals or firms have effects on third parties that are not reflected in market prices. These effects can be either beneficial or harmful.

• Positive Externality: When an action creates a benefit for others (e.g., education, vaccination).

• Negative Externality: When an action causes harm or imposes a cost on others (e.g., pollution, noise).

Property Rights

Property rights determine who controls resources and who is responsible for damages or benefits. Clearly defined property rights are essential for efficient resource allocation.

• Complete/Defined Property Rights: Clarify who controls the land, who is responsible for damage, and who receives the benefits.

• Unclear Property Rights: Lead to overuse, pollution, and inefficiency, especially for resources like air, wildlife, and groundwater.

Economic Efficiency

Economic efficiency is achieved when resources are allocated in a way that maximizes total surplus (the sum of consumer and producer surplus).

• Consumer Surplus: The difference between what consumers are willing to pay and what they actually pay.

• Producer Surplus: The difference between the price producers receive and their cost of production.

Graphical Representation: Economic efficiency occurs at the equilibrium where supply and demand intersect, maximizing total surplus.

Benefits and Costs of Externalities

Benefits	Costs
Private Benefit: Benefit received directly by the person or firm involved in the activity. Social Benefit: Total benefit to society, including private and external benefits.	Private Cost: Cost borne by the producer of a good or service. Social Cost: Total cost of producing a good or service, including private and external costs.

When no externalities exist, private costs and benefits reflect all costs and benefits to society.

Practice Example

Green Valley Farms adopted sustainable practices. For each event, classify as Private Benefit, Social Benefit, Private Cost, or Social Cost:

1. Rotational grazing: Social Benefit (improves environment), Private Benefit (better grass recovery).

2. Open Farm days: Social Benefit (education), Private Benefit (farm promotion).

3. GPS system: Private Benefit (efficiency), Social Benefit (less fuel use).

4. Drone spraying: Social Cost (spray drift), Private Benefit (efficiency).

5. LED bulbs: Private Benefit (lower bills), Social Benefit (less light pollution).

Externalities and Market Failure

Market Failure

Market failure occurs when the market fails to produce the efficient level of output, often due to externalities. This leads to deadweight loss and inefficiency.

• Negative Externality: Market produces too much of the good (e.g., pollution).

• Positive Externality: Market produces too little of the good (e.g., education).

Graphical Example: The presence of a negative externality shifts the supply curve left (higher social cost), resulting in a lower equilibrium quantity and higher price than the market outcome.

Government Policies to Deal with Externalities

Taxes and Subsidies

• Taxes: Imposed when there is an external cost (negative externality). Example: Pigovian Tax—a tax designed to make firms pay for the external cost they impose on society.

• Subsidies: Used to encourage activities with external benefits (positive externality). Example: Pigovian Subsidy—increases private benefit to match the social benefit.

These policies aim to align private incentives with social efficiency.

Market for Capital and Natural Resources

Marginal Product and Revenue Product

• Marginal Product of Labor: The additional output produced by hiring one more worker.

• Marginal Revenue Product of Labor: The additional revenue generated from hiring one more worker.

• Marginal Revenue Product of Capital: The additional revenue generated from investing in one more unit of capital.

• Marginal Revenue Product of Natural Resources: The additional revenue from using one more unit of a natural resource.

Demand for capital and natural resources is derived from their marginal revenue product.

Market for Capital

• Capital: Tangible assets (machinery, buildings, tools) and intangible assets (skills, knowledge, experience) used to produce goods and services.

• Capital is not consumed directly; it is used to create more goods, services, or wealth.

Market for Natural Resources

• Natural Resources: Inputs from nature used in production. Categorized as:

  • Renewable (e.g., forests, fish)

  • Non-renewable (e.g., oil, minerals)

  • Land (fixed supply, earns economic rent)

• Economic Rent: Payment to a resource owner for the use of a resource in fixed supply, not due to effort or production cost.

The Tax System

Purpose and Uses of Taxes

• Fund public goods (healthcare, education, infrastructure)

• Redistribute income (progressive taxes)

• Correct externalities (e.g., carbon tax)

• Stabilize the economy (fiscal policy)

Types of Taxes in Canada

• Personal Income Taxes

• Corporate Income Taxes

• Sales Taxes

• Employment Insurance Premiums

• Property Taxes

• Excise Taxes

Pie Chart: Federal government revenue sources are divided among these tax types (see original chart for proportions).

Tax Systems: Progressive vs. Proportional

Progressive Tax System	Proportional Tax System
Tax rate increases as income increases. Higher-income individuals pay a larger percentage. How it works: Income divided into brackets; each bracket taxed at a different rate.	Tax rate is the same for all income levels. Lower-income individuals pay a larger share of their income. How it works: Taxes not adjusted for income; everyone pays the same rate.

Tax Brackets and Rates (Alberta Example)

Federal Taxes	Rate	Provincial Taxes	Rate
$0 - $57,375	15%	$0 - $60,000	8%
$57,376 - $114,750	20.5%	$60,001 - $151,234	10%
$114,751 - $174,750	26%	$151,235 - $181,481	12%
$174,751 - $244,750	29%	$181,482 - $231,975	13%
$244,751+	33%	$231,976 - $362,961	14%
		$362,962+	15%

Tax Planning

• Average Tax Rate (ATR): Shows overall tax burden.

• Marginal Tax Rate (MTR): Shows the impact of earning extra income.

$\text{Average Tax Rate} = \frac{\text{Total Tax Paid}}{\text{Total Income}} \times 100\%$

$\text{Marginal Tax Rate} = \text{Rate paid on next dollar earned}$

• ATR is less relevant for decisions about earning additional income; MTR is more important for work and investment incentives.

Practice Example

Calculate total income tax for an individual in Alberta with $85,000 taxable income using the provided federal and provincial tax brackets.

Evaluating Taxes

• Economic Efficiency: Taxes should minimize distortions in economic decisions.

• Ability-to-Pay Principle: Those with greater ability to pay should contribute more.

• Horizontal-Equity Principle: Individuals with similar ability to pay should pay similar taxes.

• Benefits-Received Principle: Taxes should be related to the benefits received from government services.

• Attaining Objects Principle: Taxes should help achieve specific policy objectives.