Suppose you've regressed profits on price, assuming a quadratic functional form. Your regression equation is: Profitsi = ?0 + ?1Pricei + ?2Pricei2 + Ui. What is the marginal effect of price in this equation?
A. ?1 + ?2 × Pricei
B. ?0 + ?1 + ?2
C. ?0 + ?1 + 2?2
D. ?1 + 2?2 × Pricei
Answer: D
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