ECNOMICS Cost Curves for a Natural Monopolist 1-127 Figure 17-1 AC, MC D 300 9与日 200 AC MC D Q Quantity Mcgraw-Hilllrwin Copyright C 2001 The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin Copyright © 2001 The McGraw-Hill Companies, Inc. All rights reserved. Cost Curves for a Natural Monopolist T-127 Figure 17-1