ECSENOMICS America before and after Trade 1-110 Figure 15-3 450 Final price ratio( 2/3) 300 Exported 150 B′(+) Initial price ratio(1/2)B Imported(-) A 200 400 600 Food 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. America before and after Trade T-110 Figure 15-3