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Perfect competition foundational concepts

AP.MICRO: PRD‑3 (EU), PRD‑3.A (LO), PRD‑3.A.1 (EK), PRD‑3.A.3 (EK), PRD‑3.A.4 (EK)


Which of the following best describes the profit-maximizing rule for a perfectly competitive firm?
Choose 1 answer: