Microeconomics Foundations: Scarcity, Choice, and Economic Models

Chapter 1: Economics – Foundations and Models

Scarcity and Choice

Scarcity is a fundamental concept in economics, referring to the condition where unlimited wants exceed the limited resources available to fulfill those wants. This necessitates choices about how resources are allocated.

• Scarcity: Unlimited wants vs. limited resources (e.g., freshwater, labor).

• Economics: The study of choices people make to achieve goals given scarce resources.

• Consumer Goal: Maximize utility (satisfaction) from limited income.

• Producer Goal: Maximize profit from available resources.

• Resources: Land, labor, capital.

Example: The price of coffee in Canada increased in 2011 due to heavy rain in Colombia, illustrating how global events impact local markets.

Three Key Economic Ideas

Economists rely on three foundational ideas to analyze decision-making:

• People are rational: Individuals use available information to make decisions that they believe will make them better off, even if the outcome is not always ideal.

• Respond to incentives: Changes in incentives (e.g., higher carbon tax) alter behavior (e.g., people drive less).

• Optimal decisions are made at the margin: Decisions are made by comparing marginal benefits and marginal costs. The optimal point is where MB = MC.

Marginal Analysis: Weighing additional benefits and costs of an action.

Trade-offs and Opportunity Cost

Scarcity leads to trade-offs, requiring choices between alternatives.

• Trade-off: Producing more of one good/service means producing less of another (e.g., better healthcare vs. weaker defense).

• Opportunity Cost: The highest-valued alternative that must be given up to engage in an activity (e.g., giving up sleep for an early class).

Three Fundamental Economic Questions

Every economy must answer:

1. What goods and services will be produced? Determined by choices of consumers, firms, and government, considering opportunity costs.

2. How will goods be produced? Firms choose efficient, least costly methods, balancing labor and capital.

3. Who will receive the goods produced? Those with the greatest willingness and ability to pay; government may redistribute via taxes and subsidies.

Types of Economic Systems

Economic systems differ in how they answer the three fundamental questions.

• Centrally Planned Economy: Government decides resource allocation. Features less competition, lower quality, higher costs, and lower living standards. Examples: Venezuela, North Korea, Soviet Union.

• Market Economy: Decisions made by individuals and firms, relying on private ownership. Markets reward hard work and allow shared decision-making.

• Mixed Economy: Combines elements of both, with government intervention for redistribution and regulation.

Efficiency and Equity

Economic efficiency and equity are key goals, often in tension.

• Productive Efficiency: Goods/services produced at lowest cost.

• Allocative Efficiency: Production up to the point where marginal benefit equals marginal cost.

• Economic Efficiency: Achieved when both productive and allocative efficiency are met.

• Equity: Fair distribution of economic benefits; often requires government intervention.

Trade-off: Policies to increase equity (e.g., taxes, subsidies) may reduce efficiency.

Markets and Voluntary Exchange

A market is a group of buyers and sellers who come together to trade. Voluntary exchange makes both parties better off.

Economic Models

Economic models are simplified representations of reality used to analyze economic situations.

• Economic Variable: Measurable quantity (e.g., income, spending).

• Model Building Steps:

  1. Decide on assumptions.

  2. Formulate a testable hypothesis.

  3. Use economic data to test hypothesis.

  4. Revise model if it fails to explain data.

  5. Retain revised model for similar questions.

• Economic Theory: Accepted economic models.

Positive vs. Normative Analysis

• Positive Economics: Concerned with what is; factual analysis (e.g., data, relationships).

• Normative Economics: Concerned with what ought to be; based on subjective beliefs (e.g., policy recommendations).

Example: "Should minimum wage increase in BC?" is a normative question.

Microeconomics vs. Macroeconomics

• Microeconomics: Study of individual behavior—markets, households, firms.

• Macroeconomics: Study of the economy as a whole—price level, inflation, unemployment, GDP.

Example: A firm's decision to invest in machinery is micro, but total investment affects macroeconomic growth.

Using Graphs and Formulas

Graphs are essential tools for visualizing economic relationships.

• Vertical Axis: Usually represents the variable of interest.

• Horizontal Axis: Represents another variable, often time or quantity.

• Scale Changes: Can highlight changes at specific points.

• Demand Curve: Typically downward sloping; shows negative relationship between price and quantity demanded.

• Supply Curve: Typically upward sloping; shows positive relationship between price and quantity supplied.

• Graph Shifts: Increase in income shifts demand curve right; decrease shifts it left.

• Slope: $\text{Slope} = \frac{\text{Change in vertical axis}}{\text{Change in horizontal axis}}$

• Nonlinear Relationships: Use tangent lines to measure change between points.

Formulas

• Percentage Change: $\frac{\text{Value in 2nd period} - \text{Value in 1st period}}{\text{Value in 1st period}} \times 100$

• GDP Growth Example: $\frac{\text{GDP}_{2010} - \text{GDP}_{2009}}{\text{GDP}_{2009}}$

• Area of Rectangle: $l \times w$

• Area of Triangle: $\frac{1}{2} \times \text{base} \times \text{height}$

Chapter 2 (Preview)

Content for Chapter 2 is not included in the provided notes.

Additional info: Some explanations and examples were expanded for clarity and completeness. The notes cover all key concepts from Chapter 1, as outlined in the microeconomics syllabus.