Scarcity and Choice

Week 2 · Reasoning, Models & Scarcity

Scarcity, opportunity cost, and the structure of tradeoffs.

Time to set aside
5-7 hours: 2-3 hours reading, 1 hour worked examples, 1-2 hours decision analysis, 30 minutes review.
Progress
Ready to begin

Your AI study mentor

Sofia's briefing

Why this week

Scarcity appears whenever time, attention, energy, money, or patience is limited, so every serious choice has a cost even when no bill arrives. I moved from abstract models to a decision you actually face so that tradeoffs and opportunity cost become practical lenses rather than vocabulary to memorize. That personal example will also give us something concrete to challenge next week.

What to watch for

Economic language can clarify a tradeoff, but it can also make a personal choice seem more precise or morally neutral than it really is.

What is the next-best use of the scarce resource you are committing?

  1. 1
    Orient

    Start with the aims and questions so the readings have a purpose.

  2. 2
    Read actively

    Use the prompt under each source to produce notes, not highlights alone.

  3. 3
    Apply

    Test the ideas through observation, analysis, or a small intervention.

  4. 4
    Demonstrate

    Save the deliverables and check your work against the completion criteria.

Questions and aims

Define what you are trying to understand before deciding that you have understood it.

Study Aims

  • Define scarcity in terms of limited time, attention, money, energy, and alternatives.
  • Calculate and describe opportunity cost in ordinary language.
  • Use a budget constraint or feasible frontier to reason about a real choice.
  • Distinguish explicit costs, hidden costs, sunk costs, and marginal costs.

Guiding Questions

  • What is the real cost of a choice when the invoice is not the whole cost?
  • How does scarcity change when the scarce resource is attention rather than money?
  • Which costs matter for a future decision, and which costs are already sunk?

Before you read

While reading, test each example with one rule: a cost matters for the decision only if it changes what you can still do from here.

Core material

Reading plan

4 guided readings, in the order shown.

  1. 75-90 min

    Principles of Economics 3e: Chapter 2, Choice in a World of Scarcity Opens in new tab

    Steven A. Greenlaw, David Shapiro, Daniel MacDonald, and contributors · OpenStax

    Why it earns a place

    A clear textbook chapter on scarcity, budget constraints, opportunity cost, marginal thinking, and sunk costs.

    How to study it

    Read sections 2.1, 2.2, and 2.3. Work through the budget constraint examples slowly, and copy one graph or table into your notes in your own words.

  2. 60-75 min

    The Economy 2.0: Microeconomics Opens in new tab

    CORE Econ · CORE Econ

    Why it earns a place

    A research-informed introductory microeconomics text organized around scarcity, institutions, incentives, strategic interaction, markets, inequality, and public policy.

    How to study it

    Read section 2.2 on opportunity costs, economic rents, and incentives. Then skim section 2.8 again to connect the choice model back to week 1.

  3. 45-60 min

    The Wealth of Nations Opens in new tab

    Adam Smith · University of Chicago Press

    Why it earns a place

    Smith's foundational investigation of the division of labor, exchange, prices, wages, profit, and the sources of national wealth.

    How to study it

    Read Book I, chapters 1-2. Mark every place where the division of labor, exchange, and self-interest appear in the argument, and note what Smith does not claim.

  4. 30-45 min

    Principles of Economics 3e: Chapter 2, Choice in a World of Scarcity Opens in new tab

    Steven A. Greenlaw, David Shapiro, Daniel MacDonald, and contributors · OpenStax

    Why it earns a place

    A clear textbook chapter on scarcity, budget constraints, opportunity cost, marginal thinking, and sunk costs.

    How to study it

    Use the chapter summary and review questions as a self-check. Pay special attention to opportunity cost, marginal analysis, and sunk costs.

Apply and demonstrate

9 study actions turn the reading into observable work.

Practice

  1. Pick a real weekly allocation problem: study hours, work hours, exercise, social time, money, or sleep.
  2. Write down two scarce resources in the problem. One must be non-money, such as attention, energy, or uninterrupted time.
  3. Create a simple feasible set with at least three options. You may use a table instead of a graph.
  4. For each option, write the next-best alternative you give up. Do not list every alternative; identify the next best one.
  5. Identify one sunk cost you are tempted to include and explain why it should not decide the future choice.
  6. Write a recommendation to yourself using economic language first, then rewrite it in ordinary personal language.

Deliver

  • A one-page scarcity map of the chosen decision.
  • A small table showing options, scarce resources, opportunity cost, and the next-best alternative.
  • A 150-250 word reflection on whether the economic framing helped or distorted the choice.

Confirm

  • You can explain opportunity cost without saying 'everything I gave up.'
  • You can identify a hidden cost and a sunk cost in your own example.
  • You have produced the scarcity map and table.

Additional Resources

Optional resources for going further after the reading plan.