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Elasticity of Demand

Decent Essays

chapter four
Elasticity of Demand and Supply

CHAPTER OVERVIEW

This is the second chapter in Part Two, “Price, Quantity, and Efficiency.” Both the elasticity coefficient and the total revenue test for measuring price elasticity of demand are presented in the chapter. The text attempts to sharpen students’ ability to estimate price elasticity by discussing its major determinants. The chapter reviews a number of applications and presents empirical estimates for a variety of products. Income elasticities of demand, and price elasticity of supply are also addressed.

INSTRUCTIONAL OBJECTIVES

After completing this chapter, students should be able to:

1. Define price elasticity of demand and compute the coefficient of …show more content…

Absolute changes depend on choice of units. For example, a change in the price of a $10,000 car by $1 and is very different than a change in the price a of $1 can of beer by $1. The auto’s price is rising by a fraction of a percent while the beer rice is rising 100 percent. b. Percentages also make it possible to compare elasticities of demand for different products. 5. The midpoint formula for elasticity is: Ed = [(change in Q)/(sum of Q’s/2)] divided by [(change in P)/(sum of P’s/2)] a. Have the students calculate each of the percentage changes separately to determine whether the demand is elastic or inelastic. After the students have determined the type of elasticity, then have them insert the percentage changes into the formula. b. Students should practice this using numbers you provide, or using the table in end- of-chapter question 4-2. 6. Because of the inverse relationship between price and quantity demanded, the actual elasticity of demand will be a negative number. However, we ignore the minus sign and use absolute value of both percentage changes. D. Interpretations of Ed 1. If the coefficient of elasticity of demand is a number greater than one, we say demand is elastic; if the coefficient is less than one, we say demand is inelastic. In other words, the quantity demanded is “relatively responsive” when Ed is greater than 1 and “relatively unresponsive” when Ed is less

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