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Video of Opportunity Cost in Economics Fundamentals course by Khan Academy channel, video No. 10 free certified online
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/basic-economics-concepts-macro/production-possibilities-curve-scarcity-choice-and-opportunity-cost-macro/v/opportunity-cost
Opportunity cost (and marginal cost) based on the PPF
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