How to add demand curves

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Missed the previous lesson? https://www.khanacademy.org/economics-finance-domain/microeconomics/firm-economic-profit/labor-marginal-product-rev/v/how-many-people-to-hire-given-the-mpr-curve?utm_source=YT&utm_medium=Desc&utm_campaign=microeconomics

Microeconomics on Khan Academy: Topics covered in a traditional college level introductory microeconomics course

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