Trade deficit as a percent of GDP: Foreign Trade Division, U.S. Census Bureau, U.S. Department of Commerce.
Trade-weighted tariff barriers: World Development Indicators, The World Bank.
Medical tourism services: Companion Global Healthcare, Inc.
Number of American cars sold in China: Author estimate based on sales reports from Ford, Chrysler, and General Motors.
U.S. public sentiment on lower trade barriers: Constrained Internationalism: Adapting to New Realities: Results of a 2010 National Survey of American Public Opinion, Chicago Council on Global Affairs.
China’s share of world GDP: Historical Statistics of the World Economy: 1–2008 AD, Angus Maddison; World Economic Outlook Database, International Monetary Fund.