Opportunity Cost: AP Microeconomics & AP Macroeconomics Study Guide

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AP Microeconomics Connections

Opportunity cost is introduced in the first unit of AP Microeconomics, on basic economic concepts, and then reappears throughout the course. Expect to compute opportunity cost from a production possibilities table or frontier, determine comparative advantage between two producers, and identify a mutually beneficial terms-of-trade range. Later units rely on the same idea in a different guise: economic profit subtracts implicit costs such as forgone salary and the forgone return on the owner's own capital, which is why a firm earning zero economic profit is doing exactly as well as its next best alternative — the normal-profit condition for long-run competitive equilibrium.

AP Macroeconomics Connections

AP Macroeconomics opens with the same unit on scarcity, choice, and the production possibilities curve, then applies opportunity cost at the level of the whole economy. Choosing more consumption goods today means fewer capital goods, and therefore slower growth of the frontier tomorrow — the classic guns-versus-butter and present-versus-future trade-offs. The nominal interest rate is presented as the opportunity cost of holding money rather than earning interest, which is what makes money demand slope downward. Crowding out is likewise an opportunity-cost story: government borrowing absorbs loanable funds that would otherwise have financed private investment.

Exam Technique

For comparative advantage questions, build a small table of opportunity costs before you answer anything. With output data (units produced per period), the opportunity cost of one unit of good X is the amount of good Y given up, found by dividing Y output by X output. With input data (hours needed per unit), the ratio inverts, so read the question carefully to see which you have been given. Absolute advantage — simply producing more — is not what determines the pattern of beneficial trade; comparative advantage is. State opportunity cost in units of the other good, and always specify which good and which producer you are describing.

Key Terms to Know