Basic Economic Concepts

Name: AP Macroeconomics Unit 1: Basic Economic Concepts
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5–10% of the exam3 lessons · 41 min

What this unit covers

The topics below follow the published Macro course framework for Unit 1. This unit is worth 5–10% of the exam, so budget your time against that rather than against how long the unit takes to teach.

ScarcityOpportunity costPPCComparative advantage

Lessons in this unit

Scarcity & Opportunity Cost13 min · 3 objectivesExplain why scarcity forces every society to make choices · Define opportunity cost as the value of the next-best alternative forgone · Apply marginal (cost–benefit) thinking to an economic decision
The Production Possibilities Curve14 min · 3 objectivesInterpret a production possibilities curve as a model of scarcity, trade-offs, and efficiency · Explain why the PPC is typically bowed outward using the law of increasing opportunity cost · Distinguish movements along the PPC from shifts caused by growth
Comparative Advantage & Gains from Trade14 min · 3 objectivesDistinguish absolute advantage from comparative advantage · Calculate opportunity costs from output or input data to determine comparative advantage · Identify mutually beneficial terms of trade using the gains from specialization

Formulas in Unit 1

The rational decision rule

Do one more unit while MB ≥ MC; stop where MB = MC

Marginal benefit is the extra benefit from one more unit; marginal cost is the opportunity cost of that unit. Net benefit is maximized where the two are equal.

Opportunity cost along a straight-line PPC

Opportunity cost of 1 unit of X = (units of Y given up) / (units of X gained)

Read the trade-off directly off the axes. On a bowed PPC this ratio grows as you specialize; on a straight-line PPC it stays constant.

Opportunity cost from an output table

OC of 1 unit of Good A = (units of Good B produced) / (units of Good A produced)

Compute this ratio for each producer. Lower opportunity cost = comparative advantage. Remember "Other Over Own" when using output data.

What examiners penalize here

When a free-response question asks for the "opportunity cost" of a policy or choice, name the specific forgone alternative and, where possible, quantify it. Vague answers like "you lose money" do not earn the point — identify *what* is given up.
Label PPC diagrams precisely: axes for the two goods, a point *on* the curve for efficiency, a point *inside* for unemployment, and a *shifted* curve for growth. Graders award points for correct labeling and the correct type of change (movement vs. shift).
On comparative-advantage problems, always compute opportunity costs first, then remember the shortcut for output tables: "Other over Own." Mixing up output and input data is the most common error — with **input** data (time or resources per unit) the ratio flips to "Own over Other."

Practice Macro

Our practice bank is drawn from across the whole course rather than filtered to one unit, which is closer to how the exam asks anyway — it will not tell you which unit a question is testing.

38 practice questionsEvery one with a written explanation FRQ trainerWritten answers scored against the rubric Macro study guideAll units, weights and score data in one place All 6 Macro unitsThe full course

Questions about this unit

How much of the AP Macroeconomics exam is Unit 1?

Unit 1, Basic Economic Concepts, is worth 5–10% of the Macro multiple-choice section according to the published course framework. Across all 6 units that makes it a middling share, roughly what an even split across units would give.

What topics are covered in Macro Unit 1?

Basic Economic Concepts covers Scarcity, Opportunity cost, PPC and Comparative advantage.

How should I study Macro Unit 1?

Read the 3 lessons below first — about 40 minutes — then work practice questions on these topics. Finish with practice questions and read the explanation for every one you get right by elimination as well as the ones you miss.

All 6 units of AP Macroeconomics

Unit names, topics and exam weights follow the published College Board course framework for AP Macroeconomics. AP® is a trademark registered by the College Board, which does not endorse this site.