Question: In September 2 0 1 9 , Apple released the iPhone 1 1 Pro. The demand function for the iPhone 1 1 Pro may look

In September 2019, Apple released the iPhone 11 Pro. The demand function for the iPhone 11 Promay look like:
QD = a + bP + cPG+ dI + eA,
where QD is the quantity demanded for the iPhone 11 Pro, P is the price of the iPhone 11 Pro, PGis the price of theGalaxy A20s, I is median disposable income, and A is advertising.
a represents the "intercept," b represents the coefficientin front of P, c represents the coefficientin front of PG, d represents the coefficientin front of I, and e represents the coefficientin front of A.
Based on economic theory, the sign of b must be

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