Basic Economic Concepts Practice Questions

8 representative multiple-choice questions on basic economic concepts for AP Microeconomics, drawn from our 15-question bank for this module. Work through each one, then open “Show answer” for the correct choice and an explanation. For scored, timed practice across the full bank, take a full practice test.

1. 1. Which of the following best describes the fundamental economic problem?

   • A. Poverty prevents people from buying what they need
   • B. Resources are scarce relative to unlimited wants
   • C. Governments fail to distribute goods fairly
   • D. Markets do not always reach equilibrium
   Show answer

   Correct answer: B. Resources are scarce relative to unlimited wants

   Scarcity, meaning limited resources set against unlimited wants, is the foundational reason economics exists as a discipline. Every allocation decision involves a tradeoff because of it. Option A conflates scarcity with poverty; even Rockefeller in the 1890s faced scarcity of time and political capital. Option C identifies a distribution problem, and Option D identifies market failure. Both are real, but neither is THE fundamental economic problem that drives the entire field.

2. 2. You skip a $12/hour work shift to study for your economics exam. Your roommate offers you a free concert ticket (worth $20 to you) for the same time slot, but you decline. What is your opportunity cost of studying?

   • A. $12 (the wages you gave up)
   • B. $20 (the concert you gave up)
   • C. $32 (wages plus the concert)
   • D. $0 (studying is an investment, not a cost)
   Show answer

   Correct answer: B. $20 (the concert you gave up)

   The concert ($20) beats the shift ($12), making it the next-best alternative. Opportunity cost = $20. Option C adds both forgone options together, which is a classic error on AP exams, since opportunity cost only counts the single best alternative not taken. Option A picks the inferior alternative. Option D is wishful thinking; studying absolutely carries an opportunity cost.

3. 3. The production possibilities curve bows outward because of:

   • A. Constant opportunity costs across all production levels
   • B. Decreasing opportunity costs as more of a good is produced
   • C. Increasing opportunity costs as more of a good is produced
   • D. Economies of scale in production
   Show answer

   Correct answer: C. Increasing opportunity costs as more of a good is produced

   Resources are specialized. Farmland makes a poor factory floor, and machinists make poor farmers. As production of one good expands, the economy must pull in resources increasingly ill-suited to making it, so each additional unit costs more of the other good. That increasing opportunity cost creates the bowed-out shape. Option A would produce a straight line. Option B would produce an inward-bowing curve, which is not the standard shape. Option D describes a firm-level cost phenomenon unrelated to the PPC's geometry.

4. 4. Which of the following would shift the PPC outward?

   • A. A decrease in unemployment from 8% to 4%
   • B. A shift in production from consumer goods to capital goods
   • C. A technological improvement that increases productivity
   • D. Moving from a point inside the PPC to a point on the PPC
   Show answer

   Correct answer: C. A technological improvement that increases productivity

   New technology raises the ceiling on what the economy can produce, pushing the entire frontier outward, similar to how transistor technology expanded American productive capacity in the 1950s and 1960s. Option A is the trap: cutting unemployment moves the economy from a point inside the PPC toward the existing curve, but the curve itself stays put. The PPC represents maximum potential, and reducing unemployment means approaching that potential, not raising it. Option B changes the production mix (movement along the curve). Option D restates Option A in different words.

5. 5. A straight-line PPC implies which of the following about opportunity costs?

   • A. Opportunity costs increase as more of a good is produced
   • B. Opportunity costs decrease as more of a good is produced
   • C. Opportunity costs are constant regardless of the production mix
   • D. There are no opportunity costs because resources are unlimited
   Show answer

   Correct answer: C. Opportunity costs are constant regardless of the production mix

   Straight line means constant slope, meaning the tradeoff ratio never changes. Produce the 1st unit of X or the 100th, and you surrender the same amount of Y each time. That scenario only arises when every resource is equally suited to producing both goods. Option A describes a bowed-out (concave) PPC. Option B would produce an inward-bowing curve. Option D is nonsensical because the slope itself IS the opportunity cost, and it exists at every point.

6. 6. An economy produces only two goods: tractors and wheat. Currently it produces 10 tractors and 200 tons of wheat. If it increases tractor production to 12, it must reduce wheat output to 150 tons. The opportunity cost of the 11th and 12th tractors combined is:

   • A. 25 tons of wheat per tractor
   • B. 50 tons of wheat total
   • C. 150 tons of wheat total
   • D. 200 tons of wheat total
   Show answer

   Correct answer: B. 50 tons of wheat total

   Wheat drops from 200 to 150 tons when tractor production rises from 10 to 12. That is a loss of 50 tons for 2 additional tractors, so 50 tons combined. Option A gives the per-unit cost (25 tons each), not the combined figure the question asks for. Option C confuses the remaining wheat output with the wheat sacrificed. Option D uses the original wheat level rather than the amount forgone.

7. 7. Country M can produce 120 phones or 60 laptops. Country N can produce 80 phones or 80 laptops. If they specialize according to comparative advantage and trade 1 laptop for 1.5 phones, which statement is true?

   • A. Both countries are worse off because they lose production diversity
   • B. Only Country N gains from trade because it gets cheap phones
   • C. Both countries gain because each receives goods at a cost below their own opportunity cost
   • D. Country M loses because it gives up 1.5 phones per laptop, which is less than its domestic cost
   Show answer

   Correct answer: C. Both countries gain because each receives goods at a cost below their own opportunity cost

   Country M's domestic cost of 1 laptop is 2 phones (120/60). Country N's is 1 phone (80/80). Country N has comparative advantage in laptops; Country M in phones. At a trade price of 1.5 phones per laptop, Country M obtains a laptop for 1.5 phones instead of 2 (saving 0.5), and Country N receives 1.5 phones for a laptop that domestically cost only 1 phone (gaining 0.5 extra). Both benefit. Option A ignores two centuries of gains-from-trade logic. Option B is half right, since both gain, not just one. Option D miscalculates; 1.5 is less than M's domestic cost of 2, so M comes out ahead.

8. 8. A firm should hire an additional worker if and only if:

   • A. The worker's total output exceeds the total output of all previous workers
   • B. The marginal revenue product of the worker exceeds the wage paid to that worker
   • C. The firm's total revenue is positive
   • D. The average product of labor is still increasing
   Show answer

   Correct answer: B. The marginal revenue product of the worker exceeds the wage paid to that worker

   Marginal analysis (comparing the additional benefit to the additional cost) is the decision rule. The marginal revenue product (MRP) measures the extra revenue the worker generates; the wage is the extra cost. Hire when MRP > wage, stop when MRP = wage. Option A confuses marginal with total output. Option C is too broad; positive total revenue says nothing about whether the next hire adds more revenue than cost. Option D is wrong because a firm can profitably hire beyond the point where average product peaks, so long as MRP still exceeds the wage.