Unit 1 Test: Basic Economic Concepts
Test your AP Microeconomics Unit 1 knowledge — scarcity, opportunity cost, PPC analysis, comparative advantage, and circular flow model practice questions.
What Unit 1 Covers in AP Microeconomics
Unit 1 lays the conceptual foundation for every model you will encounter in AP Microeconomics. The College Board-style questions in this section test your ability to apply core economic reasoning — not just recall definitions — using the production possibilities curve (PPC) and comparative advantage as the primary analytical tools.
Key Topics in Unit 1
Scarcity and Opportunity Cost
Every economic decision involves a trade-off. Scarcity means that resources are limited relative to wants, so choosing one option always means giving up another. Opportunity cost is the value of the next-best alternative forgone. AP questions often present opportunity cost in the context of the PPC or comparative advantage tables.
Marginal Analysis
Rational decision-making compares marginal benefit to marginal cost. When marginal benefit exceeds marginal cost, an action is worth taking. This principle underlies profit maximization, consumer choice, and government policy decisions that appear throughout the AP exam.
The Production Possibilities Curve
The PPC shows the maximum combinations of two goods an economy can produce given its resources and technology. Key AP skills include:
- Identifying points that are efficient (on the curve), inefficient (inside), and unattainable (outside).
- Interpreting the slope of the PPC as opportunity cost.
- Distinguishing between a bowed-out PPC (increasing opportunity cost) and a straight-line PPC (constant opportunity cost).
- Explaining what causes an outward or inward shift of the PPC.
Comparative and Absolute Advantage
Absolute advantage means producing more output with the same inputs. Comparative advantage means producing at a lower opportunity cost. Trade is mutually beneficial when each party specializes in the good for which they have the comparative advantage. AP questions frequently provide a table of output per worker and ask you to calculate opportunity costs and determine who should specialize in which good.
Circular Flow Model
The circular flow diagram shows how households and firms interact through product markets and factor markets. Households supply labor and other resources to firms in factor markets and receive income in return. Firms sell goods and services to households in product markets. Understanding the direction of flows — money flows and real flows — is a common AP multiple-choice topic.
AP Exam Skills Tested in Unit 1
- PPC interpretation: Identify efficiency, growth, and opportunity cost from a PPC diagram.
- Comparative advantage calculations: Use a production table to find opportunity costs and determine the basis for trade.
- Marginal reasoning: Apply marginal analysis to simple allocation problems.
- Circular flow identification: Label flows of goods, services, resources, and money in the circular flow model.