ECSENOMICS A Simple rule for Calculating the Demand elasticity T29 Figure 4-5 A1◇ D Q 123 McGraw-Hilllrwin CopyrightC 2001 The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin Copyright © 2001 The McGraw-Hill Companies, Inc. All rights reserved. A Simple Rule for Calculating the Demand Elasticity T-29 Figure 4-5