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Perfect competition in the short run and long run

AP.MICRO: PRD‑3 (EU), PRD‑3.A (LO), PRD‑3.A.2 (EK), PRD‑3.A.5 (EK), PRD‑3.A.6 (EK), PRD‑3.A.7 (EK)


Which of the following MUST be true for a firm in a perfectly competitive market in the short run and in the long run?
Choose 1 answer: