ECSENOMICS Marginal revenue Curve Comes from Demand Curve T73 Figure 9-3 (a) Ma (b) Total Revenue d AR of fm Output of firm 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. Marginal Revenue Curve Comes from Demand Curve T-73 Figure 9-3