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: The situation in which resources (such as land, labor, and capital) are insufficient to satisfy all human wants.

• Example: The price of coffee in Canada increased in 2011 due to heavy rain in Colombia, illustrating how scarcity and resource allocation affect prices globally.

• Choice: Because of scarcity, individuals must make choices, often constrained by their budget and preferences.

• Optimal Choice: Consumers aim to maximize utility (satisfaction), while producers aim to maximize profit.

3 Key Economic Ideas

Economists rely on several foundational assumptions 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.

• Marginal Analysis: Decisions are made by weighing the additional (marginal) benefits and costs. Optimal activity occurs where marginal benefit equals marginal cost ().

• Respond to Incentives: Changes in incentives (such as taxes) influence behavior. For example, a higher carbon tax on gasoline leads to reduced driving.

Trade-offs and Opportunity Cost

Scarcity leads to trade-offs, where producing more of one good or service means producing less of another.

• Trade-off: The idea that due to scarcity, increasing production of one good requires reducing production of another.

• Opportunity Cost: The highest-valued alternative that must be given up to engage in an activity. For example, attending an 8 am class may require giving up extra sleep.

Three Fundamental Economic Questions

Every economy must answer three basic questions:

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

2. How will goods and services be produced? Firms choose production methods based on efficiency and cost, often trading off between labor and capital.

3. Who will receive the goods and services produced? Allocation is based on willingness and ability to pay, though governments may intervene through redistribution and subsidies.

Types of Economic Systems

Economic systems differ in how they answer the fundamental questions:

• Centrally Planned Economy: The government decides how resources are allocated, often resulting in less competition, lower quality, and reduced innovation. Examples include North Korea and the former Soviet Union.

• Market Economy: Decisions are decentralized, relying on private ownership and voluntary exchange. Markets reward hard work and allow for shared decision-making.

• Mixed Economy: Combines elements of both, with government intervention to promote equity and efficiency.

Efficiency and Equity

Economic efficiency and equity are central goals, often in tension with each other.

• Productive Efficiency: Goods and services are produced at the lowest possible cost.

• Allocative Efficiency: Production occurs up to the point where the last unit provides a marginal benefit equal to the marginal cost ().

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

• Equity: Refers to the fair distribution of economic benefits, often requiring government intervention through taxes and subsidies.

Economic Models and Variables

Economists use models to simplify and analyze complex real-world situations.

• Economic Variable: A measurable quantity that can take on different values, such as income or household spending.

• Economic Model: A simplified representation of reality, built to analyze economic situations and test hypotheses.

• Steps to Build a Model:

  1. Decide on assumptions.

  2. Formulate a testable hypothesis.

  3. Use economic data to test the hypothesis.

  4. Revise the model if it fails to explain the data.

  5. Retain the revised model for future analysis.

• Economic Theory: Accepted economic models that have withstood empirical testing.

Positive vs. Normative Analysis

Economics distinguishes between objective and subjective analysis:

• Positive Economics: Concerned with 'what is'—objective analysis based on facts and data.

• Normative Economics: Concerned with 'what ought to be'—subjective analysis based on values and opinions.

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

Microeconomics vs. Macroeconomics

Economics is divided into two main branches:

• Microeconomics: Studies individual behavior, markets, households, and firms.

• Macroeconomics: Examines the economy as a whole, including inflation, unemployment, growth, and GDP.

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

Using Graphs and Formulas

Graphs are essential tools for visualizing economic relationships.

• Axes: The vertical axis typically represents the variable of interest, while the horizontal axis represents another variable (such as time or quantity).

• Demand Curve: Usually slopes downward, indicating a negative relationship between price and quantity demanded.

• Supply Curve: Usually slopes upward, indicating a positive relationship between price and quantity supplied.

• Shifts: An increase in income shifts the demand curve to the right; a decrease shifts it to the left.

• Slope: Calculated as the change in the vertical variable divided by the change in the horizontal variable.

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

Formulas

• Percentage Change:

  • Example:

• Area Calculations:

  • Rectangle:

  • Triangle:

Table: Comparison of Economic Systems

Table: Types of Efficiency

Additional info: Some explanations and examples were expanded for clarity and completeness, such as the coffee price example and the distinction between micro and macroeconomics.