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15 multiple-choice questions and 11 flashcards on Foundations: Scarcity, Opportunity Cost, and Choice, about 7% of the High School Economics bank. Every one carries a written rationale.
Foundations: Scarcity, Opportunity Cost, and Choice is one of 11 chapters in CoStudy's High School Economics bank, and it holds 15 of the bank's 225 multiple-choice questions — roughly 7% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
10 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
Opportunity cost is best defined as:
Answer: B — The value of the next-best alternative forgone when a choice is made
Opportunity cost is the value of the best alternative given up when a choice is made — fundamental to rational decision-making.
An increase in consumer income for a normal good causes:
Answer: B — The demand curve to shift right
For normal goods, higher income raises demand at every price level, shifting the demand curve rightward. (Inferior goods shift left.)
You have 3 hours Saturday morning. You can either work a job paying $15/hour, mow a neighbor's lawn for a flat $60, or sleep in. If you choose the mowing job, your opportunity cost is:
Answer: D — $45 — the wages you gave up from the next-best paid alternative
D) Opportunity cost = value of the NEXT-BEST alternative given up. The job pays 3×$15 = $45. B) That's the benefit of your chosen option, not the opportunity cost. C) Only one alternative is 'given up' — you can't do both other things. A) A classic trap — opportunity cost is real even when the choice is profitable.
The bowed-out (concave) shape of a typical PPF reflects:
Answer: C — Increasing opportunity cost — resources are not equally productive in all uses
C) As you specialize more heavily in one good, you must reassign resources that are LESS suited to it, so each extra unit costs more of the other good. A) A straight-line PPF shows constant opp cost (only if resources are perfectly transferable). B) Not a standard PPF shape. D) Unrelated concept.
A country produces both wheat and cars. If it moves from a point on its PPF to a point INSIDE the frontier, this most likely reflects:
Answer: B — A rise in unemployment or idle capital — resources no longer fully or efficiently used
B) Inside-PPF points signal underutilized resources — think a recession where factories run below capacity. A/C/D) All would shift the PPF OUTWARD (growth), not move inside the existing one. Common trap: confusing 'moving inside' with 'shifting the curve.'
Which best describes a MARGINAL decision?
Answer: B — Deciding whether to eat ONE MORE slice of pizza given what you've already eaten
B) Marginal thinking compares the additional benefit of one more unit to its additional cost. A) That's a wholesale reassessment, not marginal. C) That's average, not marginal. D) That describes ignoring sunk costs — related but different from marginal analysis.
A point lying outside a country's current production possibilities frontier (PPF) represents:
Answer: C — A combination that is unattainable given current resources and technology, but might become reachable with growth
C) Points outside the PPF cannot be produced with current resources/tech; growth (more inputs or better tech) can shift the curve out. A) On-curve points are efficient. B) Inside the curve. D) PPF is about production, not market equilibrium.
Market equilibrium occurs when:
Answer: C — Quantity supplied equals quantity demanded, determining market price
At equilibrium, the quantity supplied equals quantity demanded, and there's no pressure for price to change.
Country X can produce 40 tons of wheat OR 20 tons of steel per year. Its opportunity cost of 1 ton of steel is:
Answer: D — 2 tons of wheat — because giving up 2 tons of wheat frees resources for 1 ton of steel
D) Opp cost of 1 steel = wheat forgone / steel gained = 40/20 = 2 wheat. A) That's the opp cost of wheat in terms of steel (0.5 steel per wheat). B/C) Total endpoints, not opportunity costs.
Opportunity cost is best described as:
Answer: A — The value of the next-best alternative you give up when making a choice
A) Trade-off thinking is foundational to economics. B/C/D) Each is a different concept.
4 cards from the 11 in this chapter.
What is scarcity?
The fundamental economic problem: limited resources cannot meet unlimited human wants.
What is opportunity cost?
The value of the next-best alternative given up when a choice is made.
What does a point OUTSIDE the PPF represent?
Currently unattainable, but possible with economic growth (more resources or better technology).
What is the difference between microeconomics and macroeconomics?
Micro: study of individual consumers, firms, and markets. Macro: study of economy-wide phenomena (GDP, inflation, unemployment).
These are a sample. The full Foundations: Scarcity, Opportunity Cost, and Choice chapter runs 26 items with per-chapter progress tracking, on the web and in the iOS app.
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