ECSENOMICS Market Structure Depends on C Relative Cost and Demand Factors T72 Figure 9-2 (a) Perfect Competition (b)oligopoly (c) Natural Monopoly AC AC AC 0 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. Market Structure Depends on Relative Cost and Demand Factors T-72 Figure 9-2