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Unit 1 concepts, from your notes
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Opportunity cost is what you gave up, not what you spent
Opportunity cost is the value of the next best alternative, which means it can be large even when no money changed hands. Free time spent on one thing has a cost. This is the concept the exam returns to most often, and it is the one students most often replace with the everyday meaning of cost.
The curve says four things at once
Points on it are efficient, points inside show unemployed or misused resources, points outside are unattainable, and the shape shows increasing opportunity cost. The production possibilities curve is examined by asking what a labelled point implies, so practise reading positions rather than drawing the line.
Why the curve bows, and why that matters
Resources are not equally good at producing both goods, so moving more of them across costs progressively more. A straight line would mean perfect substitutability. Being able to say which assumption produces which shape is a common question and it separates students who understood from students who memorised a picture.
Comparative advantage is about cost, not output
A country can be worse at producing everything and still have a comparative advantage in something, because advantage is defined by lower opportunity cost. Confusing it with absolute advantage is the most common error in this unit and it produces confidently wrong answers about who should specialise in what.
Where the marks actually are
In explaining a movement rather than naming a point. A question showing a shift outward wants you to say what could cause it, such as more resources or better technology, and to distinguish that from a move along the curve. Naming the axis is the floor; explaining the movement is the answer.
What to photograph for Basic Economic Concepts
Your graphs with the shifts drawn on them. Related: Statistics Unit 1, quiz options and pricing.
Sources used on this page
- College Board, AP Macroeconomics
- Opportunity cost
- Scarcity
- Production-possibility frontier
- Gross domestic product
- Inflation
- Active recall
- Spaced repetition
- Testing effect
- Forgetting curve
- Generation effect
- Judgment of learning
- Metacognition
- Desirable difficulty
- Distributed practice
- Formative assessment
- Flashcard
- Cloze test
- Multiple choice
- Test (assessment)
- Educational assessment
- Advanced Placement
- Curriculum
- Study skills
- Study guide
- Note-taking
- Overlearning
- Instructional scaffolding
- Item analysis
| Where the point is | What it means | Typical cause |
|---|---|---|
| On the curve | Efficient use of resources | Full employment |
| Inside the curve | Unemployed or misused resources | Recession, misallocation |
| Outside the curve | Unattainable now | Needs growth |
| Curve shifts outward | Capacity increased | More resources or better technology |
| Curve bows | Increasing opportunity cost | Resources not equally suited |
| Curve is straight | Constant opportunity cost | Perfect substitutability |
What is AP Macroeconomics Unit 1?
Basic Economic Concepts: scarcity, opportunity cost, the production possibilities curve, and absolute against comparative advantage.
What is opportunity cost exactly?
The value of the next best alternative given up. It can be large even when no money changed hands, which is where the everyday meaning of cost misleads.
What does a point inside the curve mean?
That resources are unemployed or being used inefficiently. Points on the curve are efficient and points outside are unattainable with current resources.
Why does the curve bow outward?
Because resources are not equally suited to producing both goods, so shifting more of them across costs progressively more. A straight line would mean perfect substitutability.
How is comparative advantage different from absolute advantage?
Comparative advantage means a lower opportunity cost. A country can be worse at producing everything and still have one, which is why it decides specialisation.
Where are the marks in this unit?
In explaining movements rather than naming points. Say what could shift the curve outward, and distinguish that from moving along it.
Last updated: 2026-08-15