AP Macroeconomics, AP exams

Unit 1: Basic Economic Concepts

Unit 1 introduces scarcity, opportunity cost, and the two models that support everything later in the course: the production possibilities curve and supply and demand. Comparative advantage and the gains from trade appear here and return in the international unit. The unit is short but its errors compound, so precision now saves time later.

Position: 1 of 6 units
Topics covered: 6 topics in this guide

What is covered

Topics inside this unit.

These topics describe the scope students most often review for this part of AP Macroeconomics. Treat them as a study checklist rather than an exhaustive list of what a single exam form can sample.

Scarcity and opportunity cost: Limited resources against unlimited wants, and the cost of any choice measured as the next best alternative forgone.
Resource allocation and economic systems: How market, command, and mixed systems answer what to produce, how to produce it, and for whom.
The production possibilities curve: Efficiency, attainable and unattainable output combinations, increasing opportunity cost, and shifts from growth.
Comparative advantage and trade: Absolute versus comparative advantage, calculating opportunity cost per unit, and identifying mutually beneficial terms of trade.
Marginal analysis: Decisions made by comparing marginal benefit with marginal cost rather than by totals or averages.
Supply, demand, and market equilibrium: Determinants that shift each curve, movement along versus shifts, and the effects of surpluses and shortages.

Study tips

How to practice Basic Concepts.

Section-specific guidance that follows from how this material is usually tested.

Practice comparative advantage calculations both per unit of output and per unit of input.
Say out loud whether a change moves along a curve or shifts it; the distinction shows up all year.
Get comfortable drawing quick, accurate axes now, since every later unit depends on that habit.

Where this fits

Unit 1: Basic Economic Concepts is 1 of 6 units in the AP Macroeconomics guide. Use the full guide to balance it against everything else you have to review.

Back to the AP Macroeconomics guide Official exam information

Sample Basic Concepts questions

Practice questions, not yet expert-reviewed

Original practice questions written to the published framework for this section. No expert has reviewed them, and they are not taken from any official exam. Try each one before you open the answer.

Question 1Foundational
What does the opportunity cost of a decision measure?
1. AThe value of the next best alternative that was given up
2. BThe combined value of every alternative that was given up
3. CThe amount of money actually paid for the option chosen
4. DThe difference between the total benefit and the total cost of the choice
Show answer
Answer: A. The value of the next best alternative that was given up
Opportunity cost counts only the single best forgone option, because that is the one alternative you could actually have had instead. Summing every alternative is the tempting distractor, but the alternatives were mutually exclusive, so counting all of them would multiply the same sacrifice several times over.
Key insight: Opportunity cost is what you gave up, not what you paid, which is why an unpaid hour of study still has a real cost.
Question 2Foundational
A country using all of its resources can produce either 100 tons of wheat or 50 tons of steel. What is the opportunity cost of producing one ton of steel?
1. A2 tons of wheat
2. B0.5 tons of wheat
3. C50 tons of wheat
4. D100 tons of wheat
Show answer
Answer: A. 2 tons of wheat
Dividing the 100 tons of wheat forgone by the 50 tons of steel gained shows that each ton of steel costs 2 tons of wheat. The 0.5 answer is the tempting distractor because it inverts the ratio and actually gives the opportunity cost of one ton of wheat, which is half a ton of steel.
Key insight: Put the good you are gaining in the denominator: opportunity cost per unit is always what you give up divided by what you get.
Question 3Intermediate
Using all its resources, Country A can produce 10 units of cloth or 20 units of wine, and Country B can produce 6 units of cloth or 6 units of wine. In which good does Country B hold a comparative advantage?
1. ACloth
2. BWine
3. CBoth cloth and wine
4. DNeither good
Show answer
Answer: A. Cloth
For Country B one unit of cloth costs one unit of wine, while for Country A one unit of cloth costs two units of wine, so B is the lower-cost cloth producer. Answering that B has no comparative advantage is the tempting response because A can out-produce B in both goods, but absolute advantage in everything never eliminates comparative advantage, which depends on relative opportunity costs.
Key insight: Absolute advantage compares output totals; comparative advantage compares what each producer sacrifices, and every producer is relatively cheapest at something.
Question 4Intermediate
An economy is producing at a point located inside its production possibilities curve. What does that tell you about the economy?
1. ASome of its resources are unemployed or being used inefficiently
2. BIt is producing more output than its resources can sustain
3. CIts potential output has permanently increased
4. DIt must trade with other countries to consume that combination
Show answer
Answer: A. Some of its resources are unemployed or being used inefficiently
Points inside the curve are attainable but wasteful, since the economy could produce more of at least one good without producing less of the other. Producing beyond sustainable capacity is the tempting distractor, but that describes points outside the curve, which are unattainable with current resources and technology.
Key insight: Inside the curve means inefficiency, on the curve means efficiency, and outside the curve means unattainable without growth or trade.
Question 5Advanced
A student values the first hour of study at 50 points, the second at 30, the third at 15, and the fourth at 5, while every hour of study costs 20 points of forgone leisure. How many hours should the student study to maximize net benefit?
1. A2 hours
2. B1 hour
3. C3 hours
4. D4 hours
Show answer
Answer: A. 2 hours
The first hour adds 50 against a cost of 20 and the second adds 30 against 20, so both are worth taking, but the third adds only 15 against a cost of 20 and would reduce net benefit. Studying 3 hours is the tempting distractor because total benefit is still rising, yet the rule is to stop where marginal benefit last exceeds marginal cost, not where total benefit peaks.
Key insight: Keep going while marginal benefit exceeds marginal cost and stop the moment it does not; totals never decide marginal questions.

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Unit 1: Basic Economic Concepts