Supply and Demand: AP Microeconomics & AP Macroeconomics Study Guide

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AP Microeconomics Connections

Supply and demand is the backbone of the AP Microeconomics course, anchoring the unit on supply, demand, and market equilibrium and reappearing in nearly every later unit. You are expected to identify the determinant behind a shift, draw a correctly labeled diagram, and state the effect on equilibrium price and quantity. The same machinery returns in the analysis of price ceilings and floors, per-unit taxes and subsidies, consumer and producer surplus, deadweight loss, and factor markets, where the same axes are relabeled as wage and quantity of labor. Free-response questions frequently combine a shift with a welfare question, so practice reading surplus areas off the graph, not just the intersection point.

AP Macroeconomics Connections

AP Macroeconomics reuses the shift-versus-movement logic at the level of the whole economy. Aggregate demand and short-run aggregate supply behave like their microeconomic cousins: something other than the price level shifts the curve, while a change in the price level moves you along it. The same reasoning drives the money market (interest rate and quantity of money), the loanable funds market (real interest rate and quantity of loanable funds), and the foreign exchange market (exchange rate and quantity of currency). If you can reliably separate shifts from movements in a single goods market, the macro graphs become much less intimidating.

Free-Response Conventions

AP graders award points for specific, visible things. Label both axes (price and quantity, or the macro equivalents), label every curve, and label the original equilibrium price and quantity with subscripts before you shift anything. Draw the new curve as a distinct line and clearly label it. Use arrows to show the direction of the shift. When a question asks for the effect on a variable, answer with a direction word — increases, decreases, or remains unchanged — and, when asked, explain why using the determinant, not just the graph. Vague answers such as "the market adjusts" earn nothing.

Key Terms to Know