Exam 5: Elasticity and Its Applications: The Elasticity of Demand

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When a university bookstore prices chemistry textbooks at $200 each,it generally sells 120 books per month.If it lowers the price to $160,sales increase to 160 books per month.Given this information,we know that the price elasticity of demand for chemistry books is about

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The income elasticity of demand for caviar tends to be

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Figure 5-11 Figure 5-11   -Refer to Figure 5-11.Suppose this demand curve is a straight,downward-sloping line all the way from the horizontal intercept to the vertical intercept.We choose two prices,P<sub>1</sub> and P<sub>2</sub>,and the corresponding quantities demanded,Q<sub>1</sub> and Q<sub>2</sub>,for the purpose of calculating the price elasticity of demand.Also suppose P<sub>2</sub> > P<sub>1</sub>.In which of the following cases could we possibly find that (i)demand is elastic and (ii)a decrease in price from P<sub>1</sub> to P<sub>2</sub> causes an decrease in total revenue? -Refer to Figure 5-11.Suppose this demand curve is a straight,downward-sloping line all the way from the horizontal intercept to the vertical intercept.We choose two prices,P1 and P2,and the corresponding quantities demanded,Q1 and Q2,for the purpose of calculating the price elasticity of demand.Also suppose P2 > P1.In which of the following cases could we possibly find that (i)demand is elastic and (ii)a decrease in price from P1 to P2 causes an decrease in total revenue?

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