Day 1

Thinking Like an Economist

  • Importance of Economic Thinking

    • Essential for success in understanding economics.

    • Many students struggle due to a reluctance to adopt an economist's mindset.

  • Roles of Economists

    • Scientists: Explain world events and conditions.

    • Policy Advisers: Provide suggestions for improving economic conditions.

    • Focus in this class will be on the scientist role, explaining economic functioning.

Scientific Method in Economics

  • Economists' Approach

    • Use the scientific method: Develop hypotheses, test theories, gather knowledge.

    • Example of Physics Theory: Dropping a feather vs. a bowling ball.

      • In a vacuum, both fall at the same rate.

      • In real-world scenarios, factors like air resistance change the outcome.

  • Testing Economic Theories

    • Challenge: Testing theories like inflation resulting from excessive money printing.

    • Laboratory experiments are impractical for economic phenomena due to ethical concerns.

    • Thought Experiments: Economists use models to analyze theories mentally instead of physically.

Models in Economics

  • Definition of a Model

    • A framework consisting of assumptions and variables to simplify complex realities.

  • Role of Assumptions

    • Necessary to make complex economic situations understandable.

    • Example: Analyzing international trade by limiting to two countries and two goods.

Circular Flow Diagram

  • Purpose and Definition

    • A visual model displaying how money flows in an economy.

    • Shows interactions between households and firms.

  • Key Components

    • Two main agents: Households and Firms.

    • Decision Makers: Interact in various markets (goods, labor, factors of production).

Interactions in the Market

  • Example Interaction with Starbucks

    • Consumption: Households buy lattes from Starbucks.

    • Labor Market: Households provide labor (workers).

    • Factors of production mentioned: Labor, physical capital (machines), and land (location).

Factors of Production

  • Definition

    • Inputs used in the production of goods and services.

  • Three types:

    • Labor: Human effort in production.

    • Physical Capital: Machinery and equipment.

    • Land: Physical space used for production.

Capital Market

  • Households invest in firms (e.g., buying stocks in Starbucks).

  • Investments provide firms with capital to purchase production inputs.

  • Returns on investment: Expected profits as stocks appreciate.

Summary of Circular Flow Diagram

  • Households own factors of production and sell/rent them to firms.

  • Firms produce goods/services using factors provided by households.

  • Diagrams show flow of dollars (green arrows) and goods/services (red arrows).

  • Represents a continuous cycle within an economy.

Production Possibilities Frontier (PPF)

  • Definition

    • A graph indicating maximum output combinations of two goods given resources and technology.

  • Assumptions for Simplicity

    • Only two groups of products (e.g., computers and wheat) and one resource: labor.

  • Numerical Assumptions

    • Producing one computer requires 100 labor hours.

    • Producing one ton of wheat requires 10 labor hours.

    • Total labor available: 50,000 hours.

Evaluating Production Options

  • Demonstrating possible labor allocations among the two goods:

    • Full allocation to computers, partial allocations, and full allocation to wheat.

  • Basic calculations for potential outputs are drawn to show production capacities.

  • Graphical representation of points shows where output combinations lie on the frontier.

Graphing the Production Possibilities

  • Coordinate system: Horizontal Axis (computers) & Vertical Axis (wheat).

  • Points on the graph represent different combinations of production:

    • Connected points form the PPF line.

  • Possible combinations characterized by efficiency (on the curve), underutilization (inside the curve), and overutilization (outside the curve).