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M01.L01 — What is Economics? Scarcity, Choice, and Opportunity Cost

Module: Module 01 — Introduction: Scarcity, Choice, and the Economic Method
Lesson: L01 of 05
Duration: ~30 minutes
Level: Introductory
Provenance: OpenStax Principles of Microeconomics 3e | Khan Academy Microeconomics

Learning Objective

Explain how scarcity forces economic choices.

The Fundamental Economic Problem

Economics begins with the recognition that resources are limited while human wants are unlimited. In Australia, this plays out in everyday decisions: should we mine more iron ore in Western Australia or preserve the land? Should the RBA raise interest rates to control inflation or prioritize employment growth? These trade-offs exist because we can't have everything we want simultaneously.

The economic problem has three components: 1. What to produce (e.g., more housing vs. commercial buildings) 2. How to produce it (e.g., automated mining vs. labor-intensive methods) 3. For whom to produce (e.g., luxury goods for high-income earners vs. essentials for all)

Worked Example

Choosing between university and work

  1. Sarah finishes high school in Sydney and faces a choice: attend university or work full-time at Woolworths for $50,000/year.
  2. If she chooses university, her opportunity cost is the $150,000 she could earn over 3 years plus any work experience.
  3. If she chooses work, her opportunity cost is the higher lifetime earnings and career options from a degree (estimated $1 million extra over 40 years).
  4. Rational choice suggests weighing these marginal benefits against costs.

Common Misconception

"Opportunity cost is just the monetary value of the next best alternative"

Opportunity cost includes all sacrificed alternatives - time, experiences, and non-monetary factors. Choosing to watch Netflix instead of studying costs both potential grades and the satisfaction of learning.

Key Takeaways

  • Scarcity exists because resources are limited relative to unlimited wants
  • Every choice has an opportunity cost - what you give up when making a decision
  • Economics studies how societies allocate scarce resources
  • Positive economics describes what is, while normative economics argues what should be

Practice

  1. Identify the opportunity cost of the Australian government building a new hospital instead of a school.
  2. Explain how scarcity affects your daily life with three examples.
  3. Why is "there's no such thing as a free lunch" an economic truth?

Further Resources

Provenance: OpenStax Principles of Microeconomics 3e | Khan Academy Microeconomics