Question

The demand for pizzas in a large town is written as: Qd= 120 - 10P +...

The demand for pizzas in a large town is written as: Qd= 120 - 10P + 5Pb- 0.5Ps- 10Y, where Qdis the quantity demanded, P is the price, Pb is the price of burritos, Ps is the price of soft drinks soldin the pizza restaurants, and Y is personal income per month (in thousand dollars). What is∆Q/∆Ps?

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Answer

-0.5

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the change in quantity because the change in the price of a related good is found by the differentiation of the demand function with respect to the price

д(120 — 10P + 5P, — 0,5P — 10Y) 2 ӘР, = -0,5 ДР, ӘР,

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