Economics Module 1: Economic Thinking

1. Understanding Economics and Scarcity

  • Scarcity: Limited resources cannot satisfy all human wants.

  • Economics: Study of trade-offs and choices made due to scarcity.

  • Opportunity Cost: Value of the next best alternative given up when choosing one option over another.

2. Goods and Resources

  • Economic Goods (Scarce Goods): Goods/services requiring payment.

  • Free Goods: Goods/services obtained at no cost due to abundance (eg. sunlight, oxygen)

  • Productive Resources (Factors of Production):

    1. Land – Natural resources (land, trees, plants, livestock, wind, water, sun, etc.).

    2. Economic Capital – Manufactured tools, machinery used in production (not financial capital).

    3. Labor (Human Capital) – Physical or intellectual human services.

    4. Entrepreneurship – Recognizing profit opportunities, organizing resources, taking risks.

3. Opportunity Cost

  • Individual Decisions: Shapes personal choices (e.g., leisure vs. work).

  • Societal Decisions: Trade-offs in policy (e.g., universal healthcare vs. defense spending).

4. Labor, Markets, and Trade

  • Division of Labor: Breaking work into tasks done by different workers.

  • Specialization: Workers/firms focus on tasks suited to their skills and then use the pay you receive to buy the goods and services you need or want.

  • Economies of Scale: Average cost per unit decreases as total output increases.

  • Trade & Markets: Specialization requires exchange; markets enable income use to purchase goods/services.

5. Microeconomics vs. Macroeconomics

  • Microeconomics: Focuses on the actions of particular agents within the economy like, households, workers, and firms.

    • Consumer behavior, firm decisions, prices, labor, financing, production, expansion/downsizing.

  • Macroeconomics: the branch of economics that focuses on economy-wide issues such as growth, unemployment, inflation, trade balance.

    • Uses Monetary Policy (involves altering interest rates, availability of credit, and the extent of borrowing) and

    • Fiscal Policy (government spending, taxes).

6. Economic Models

  • Economic Models: Simplified versions of reality that allows us to observe, understand and predict behavior.

  • Mathematics & Graphs: Used to explain models (algebra, diagrams).

  • Circular Flow Diagram:

    • A graph that shows that households & firms interact in:

      • Goods-and-services market (product market) – Firms sell, households buy.

      • Labor market – Households sell labor, firms hire.

7. Functions and Equations

  • Functions: shows the relationship between variables. Show cause (independent variables) and effect (dependent variable).

  • Order of Operations:

    1. simplify Parentheses/brackets

    2. simplify Exponents

    3. Multiply/divide (left to right)

    4. Add/subtract (left to right)

  • Linear Equations: y = b + mx (m = slope, b = y-intercept).

  • Variable: a quantity that can assume a range of values represented by a letter or a symbol.

8. Graphs in Economics

  • Intercept: Where line crosses axis.

  • Slope: Change in vertical axis ÷ change in horizontal axis.

    • Positive slope → variables move in same direction, when one increases the other increases, when one decrease the other decreases as well.

    • Negative slope → variables move in opposite directions, when one increases the other decreases, when one decreases the other increases.

    • Zero slope( Slope of Zero) → one variable changes, the other doesn’t

    •x-axis: the horizontal line on a graph, commonly represents quantity (q) on graphs in economics.

    •y-axis: the vertical line on a graph, commonly represents price (p) on graphs in economics.

  • Nonlinear Relationships: Curves with positive/negative slopes; slope changes along curve.

9. Types of Graphs

  • Line Graphs: Show relationships between two variables, often time series.

  • Pie Graphs: Show proportions of a whole (e.g., population by age).

  • Bar Graphs: Compare quantities, can show breakdowns of groups.

Choosing a Graph:

  • Line → changing variables over time.

  • Pie → parts of a whole.

  • Bar → comparisons among categories.

10. Quick Review Questions

  • What is scarcity and how does it impact the economy?

  • What are the productive resources (factors of production)?

  • Define opportunity cost and its role in decision-making.

  • Why do trade and markets exist?

  • Distinguish between microeconomics and macroeconomics.

  • Why are economic models important?

  • What are common economic models used?

  • How are equations/functions used in economics?

  • How do graphs show relationships between variables?

  • How to differentiate between positive, negative, and zero slope relationships?