The foundation of every other unit. Scarcity and opportunity cost, the production possibilities curve, comparative advantage and trade, and the basics of supply, demand, and market equilibrium. Master this and the rest of AP Macro gets a lot easier.
Six ways to master Unit 1 — pick whichever fits how you like to study.
Six topics from the College Board CED, in order.
Unit 1 is the conceptual foundation for the rest of AP Macroeconomics. You'll learn why scarcity forces every choice to have a cost — and how the production possibilities curve turns that idea into a model economists use constantly. You'll also meet the engine of every market: supply and demand, the tool that explains how prices and quantities are determined and how they change.
This unit is roughly 5–10% of the AP Macro exam and takes about 7–9 class periods. It's the smallest unit by exam weight, but every later unit assumes you can read a supply-and-demand graph and explain opportunity cost without hesitation. If you can't explain why a shift in demand is different from a movement along the demand curve here, Units 3 and 4 (the big models) will be much harder.
Three ideas anchor Unit 1 and recur across the whole course — including two of the College Board's Big Ideas, Markets (MKT) and Macroeconomic Models (MOD):