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Business & economics · Grades 8–12

Opportunity cost and constrained choices

Use a simple decision model without assuming every value has a price.

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Learn the idea

Scarcity

Limited time or resources require choices.

Opportunity cost

The opportunity cost is the value of the next-best alternative forgone.

Margin

A marginal comparison considers the additional benefit and cost of one change.

Context

Nonfinancial outcomes and distributional effects can also matter.

Worked examples

What is opportunity cost?

The forgone next-best option is the comparison.

The value of the next-best alternative given up.

A fictional project receives 200 units of revenue and has 140 units of stated cost. Find its accounting surplus before any other costs.

200 − 140 = 60 units under the limited definition.

60

Check your understanding

  1. A marginal cost concerns what?

    1. Only all historical costs together.
    2. Only a sunk cost.
    3. The extra cost of an additional change or unit.

  2. Why can a free activity still have an opportunity cost?

  3. An extra batch earns 40 units and adds 25 units of stated cost. Find the incremental surplus.

Answers and marking notes

Answers and marking notes
  1. The extra cost of an additional change or unit.

    Marginal means additional at the margin.

  2. It uses time or resources that could have been used for another valued activity.

    A zero monetary price does not imply no forgone alternative.

  3. 15

    40 − 25 = 15.

Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.