Page 373 Example 4: The data come from the website of the U.S. Census Bureau. Go to www.census.gov/hhes/www/income/data/historical/household/index.html.

Page 376 Information about the effects of changes in the Consumer Price Index is from Bureau of Labor Statistics, “Updated response to the recommendations of the advisory commission to study the Consumer Price Index,” June 1998. The entire December 1996 issue of the BLS Monthly Labor Review is devoted to the major revision of the CPI that became effective in January 1998. The effect of changes in the CPI is discussed by Kenneth J. Stewart and Stephen B. Reed, “CPI research series using current methods, 1978–98,” Monthly Labor Review, 122 (1999), pp. 29–38. All of these are available on the BLS website.

Page 377 The survey of government statistics offices is reported in “The good statistics guide,” Economist, September 13, 1993, p. 65.

Page 382 Exercise 16.8: The data are from the U.S. Department of Energy website, www.eia.gov/dnav/pet/pet_pri_gnd_dcus_nus_a.htm.

Page 382 Exercise 16.11: The data are from the U.S. Environmental Protection Agency’s Toxic Release Inventory (TRI) Program website, http://iaspub.epa.gov/triexplorer/tri_release.chemical.

Page 384 Exercise 16.20: The data are from the website http://en.wikipedia.org/wiki/PGA_Tour.

Page 386 Exercise 16.32: Gordon M. Fisher, “Is there such a thing as an absolute poverty line over time? Evidence from the United States, Britain, Canada, and Australia on the income elasticity of the poverty line,” U.S. Census Bureau Poverty Measurement Working Papers, 1995.

Page 386 Exercise 16.33: G. J. Borjas, “The internationalization of the U.S. labor market and the wage structure,” Federal Reserve Bank of New York Economic Policy Review, 1, No. 1 (1995), pp. 3–8. The quotation appears on p. 3. This entire issue is devoted to articles seeking to explain stagnant earnings and the income gap. The consensus: we don’t know.