ECSENOMICS U.S. Real Gross Domestic Product 1929-1999 1-144 Figure 20-1 0.000 8.000 6.000 4.000 4=955三-5豆 2.000 llllll」 1930 19401950 1960 1970198 1990 20MN Year McGraw-Hilllrwin Source: U.S. Department of Commerce. Shaded regions are major economic downturnsMcGraw-Hill/Irwin Copyright © 2001 The McGraw-Hill Companies, Inc. All rights reserved. U.S. Real Gross Domestic Product, 1929-1999 T-144 Figure 20-1 Source: U.S. Department of Commerce. Shaded regions are major economic downturns