Updated August 13, 2015: This new edition includes corrected estimates for Iceland, Luxembourg, the Netherlands and Taiwan, and some related aggregated data.
Alwang, Jeffrey, Paul B. Siegel and Steen L. Jorgensen. 2001. “Vulnerability: A View from Different Disciplines.” Washington, D.C.: World Bank, June. http://documents.worldbank.org/curated/en/2001/06/1637776/vulnerability-view-different-disciplines
Baicker, Katherine and Amitabh Chandra. 2005. “The Labor Market Effects of Rising Health Insurance Premiums.” Cambridge, MA: National Bureau of Economic Research, February. http://www.nber.org/papers/w11160
Basu, Sudip Ranjan. 2009. “Comparing China and India: Is the Dividend of Economic Reforms Polarized?” The European Journal of Comparative Economics. http://eaces.liuc.it/18242979200901/182429792009060105.pdf
Birdsall, Nancy. 2010. “The (Indispensable) Middle Class in Developing Countries; or, the Rich and the Rest, not the Poor and the Rest.” Washington, D.C.: Center for Global Development, March. http://www.cgdev.org/publication/indispensable-middle-class-developing-countries-or-rich-and-rest-not-poor-and-rest
Birdsall, Nancy. 2012. “Is India’s Middle Class Big Enough For …?” Washington, D.C.: Center for Global Development, November. http://www.cgdev.org/blog/india%E2%80%99s-middle-class-big-enough
Birdsall, Nancy. 2015. “Does the Rise of the Middle Class Lock in Good Government in the Developing World?” Washington, D.C.: Center for Global Development, April. http://www.cgdev.org/publication/does-rise-middle-class-lock-good-government-developing-world
Birdsall, Nancy, Nora Lustig and Christian J. Meyer. 2013. “The Strugglers: The New Poor in Latin America?” Washington, D.C.: Center for Global Development, August. http://www.cgdev.org/publication/strugglers-new-poor-latin-america-working-paper-337
Bosworth, Barry, and Susan M. Collins. 2007. “Accounting for Growth: Comparing China and India.” Cambridge, MA: National Bureau of Economic Research, February. http://www.nber.org/papers/w12943
Bourguignon, Francois, and Christian Morrisson. 2002. “Inequality Among World Citizens: 1820-1992.” American Economic Review, September. https://www.aeaweb.org/articles.php?doi=10.1257/00028280260344443
Chandy, Laurence, and Homi Kharas. 2014. “What Do New Price Data Mean for the Goal of Ending Extreme Poverty?” Washington, D.C.: Brookings Institution, Up Front, May. http://www.brookings.edu/blogs/up-front/posts/2014/05/05-data-extreme-poverty-chandy-kharas
Chen, Shaohua, and Martin Ravallion. 2004. “How Have the World’s Poorest Fared Since the Early 1980s?” Washington, D.C.: World Bank, June. https://openknowledge.worldbank.org/bitstream/handle/10986/14047/wps3341.pdf?sequence=1
Chen, Shaohua, and Martin Ravallion. 2010. “The Developing World Is Poorer than We Thought, but No Less Successful in the Fight Against Poverty.” The Quarterly Journal of Economics, November. http://qje.oxfordjournals.org/content/125/4/1577.short
Cho, Yoonyoung, and Bienvenue N. Tien. 2014. “Sub-Saharan Africa’s Recent Growth Spurt: An Analysis of the Sources of Growth.” Washington, D.C.: World Bank, May. http://documents.worldbank.org/curated/en/2014/05/19460685/sub-saharan-africas-recent-growth-spurt-analysis-sources-growth
Cingano, Federico. 2014. “Trends in Income Inequality and its Impact on Economic Growth.” Paris, France: Organization for Economic Cooperation and Development, December. http://www.oecd-ilibrary.org/social-issues-migration-health/trends-in-income-inequality-and-its-impact-on-economic-growth_5jxrjncwxv6j-en
Congressional Budget Office. 2011. “Trends in the Distribution of Household Income Between 1979 and 2007.” Washington, D.C., October. http://www.cbo.gov/sites/default/files/cbofiles/attachments/10-25-HouseholdIncome.pdf
Court, David, and Laxman Narasimhan. 2010. “Capturing the World’s Emerging Middle Class.” McKinsey Quarterly, July. http://www.mckinsey.com/insights/consumer_and_retail/capturing_the_worlds_emerging_middle_class
Dabla-Norris, Era, Kalpana Kochhar, Nujin Suphaphiphat, Frantisek Ricka and Evridiki Tsounta. 2015. “Causes and Consequences of Income Inequality: A Global Perspective.” Washington, D.C.: International Monetary Fund, June. http://www.imf.org/external/pubs/ft/sdn/2015/sdn1513.pdf
Dadush, Uri, and William Shaw. 2011. “Juggernaut: How Emerging Markets Are Reshaping Globalization.” Washington, D.C.: Carnegie Endowment for International Peace. http://carnegieendowment.org/files/juggernaut_final.pdf
Dang, Hai-Anh H., and Peter F. Lanjouw. 2014. “Welfare Dynamics Measurement: Two Definitions of a Vulnerability Line and their Empirical Application.” Washington, D.C.: World Bank, June. http://documents.worldbank.org/curated/en/2014/06/19705818/welfare-dynamics-measurement-two-definitions-vulnerability-line-empirical-application
Deaton, Angus. 2003. “Measuring Poverty in a Growing World (or Measuring Growth in a Poor World).” Cambridge, MA: National Bureau of Economic Research, July. http://www.nber.org/papers/w9822
Deaton, Angus, and Bettina Aten. 2014. “Trying to Understand the PPPs in ICP2011: Why Are the Results so Different?” Cambridge, MA: National Bureau of Economic Research, June. http://www.nber.org/papers/w20244
Dobbs, Richard, Jaana Remes, James Manyika, Charles Roxburgh, Sven Smit and Fabian Schaer. 2012. “Urban World: Cities and the Rise of the Consuming Class.” McKinsey & Company, June. http://www.mckinsey.com/insights/urbanization/urban_world_cities_and_the_rise_of_the_consuming_class
Dykstra, Sarah, Benjamin Dykstra and Justin Sandefur. 2014. “We Just Ran Twenty-Three Million Queries of the World Bank’s Website.” Washington, D.C.: Center for Global Development, April. http://www.cgdev.org/publication/we-just-ran-twenty-three-million-queries-world-banks-website-working-paper-362
Elsby, Michael W. L., Bart Hobijn, and Aysegul Sahin. 2013. “The Decline of the U.S. Labor Share.” Washington, D.C.: Brookings Institution. http://www.brookings.edu/~/media/Projects/BPEA/Fall-2013/2013b_elsby_labor_share.pdf?la=en
Ferreira, Francisco H.G., Julian Messina, Jamele Rigolini, Luis-Felipe Lopez-Calva, Maria Ana Lugo and Renos Vakis. 2012. “Economic Mobility and the Rise of the Latin American Middle Class.” Washington, D.C.: World Bank, November. http://elibrary.worldbank.org/doi/abs/10.1596/978-0-8213-9634-6
Financial Times. 2014. “World Bank Eyes Biggest Global Poverty Line Increase in Decades.” London, U.K.: May. http://www.ft.com/cms/s/0/091808e0-d6da-11e3-b95e-00144feabdc0.html#axzz3UIjx1SGl
Fukuyama, Francis. 2011. “Is There a Proper Sequence in Democratic Transitions?” Current History, November. http://www.currenthistory.com/Article.php?ID=921
Government of India Planning Commission. 2014. “Report of the Expert Group to Review the Methodology for Measurement of Poverty.” June. http://planningcommission.nic.in/reports/genrep/pov_rep0707.pdf
Hout, Michael. 2007. “How Class Works in Popular Conception: Most Americans Identify with the Class Their Income, Occupation, and Education Implies for Them.” Berkeley, CA: Survey Research Center, February. http://ucdata.berkeley.edu/publication_record.php?recid=96
International Monetary Fund. 2014. “World Economic Outlook: Legacies, Clouds, Uncertainties.” Washington, D.C.: October. http://www.imf.org/external/pubs/ft/weo/2014/02/
International Monetary Fund. 2015. “Global Prospects and Policy Challenges.” G-20 Finance Ministers and Central Bank Governors Meeting, Istanbul, Turkey, February 9-10. http://www.imf.org/external/np/g20/pdf/2015/020915.pdf
Jaumotte, Florence. 2012. “Is Labor Compensation Still Falling in Advanced Economies?” IMF Survey Magazine, May. http://www.imf.org/external/pubs/ft/survey/so/2012/NUM052412A.htm
Kharas, Homi. 2010. “The Emerging Middle Class in Developing Countries.” Paris, France: OECD Development Centre, January. http://www.oecd.org/dev/44457738.pdf
Lakner, Christoph, and Branko Milanovic. 2013. “Global Income Distribution: From the Fall of the Berlin Wall to the Great Recession.” Washington, D.C: World Bank, December. http://elibrary.worldbank.org/doi/pdf/10.1596/1813-9450-6719
Leke, Acha, Susan Lund, Charles Roxburgh and Arend van Wamelen. 2010. “What’s Driving Africa’s Growth.” McKinsey & Company, June. http://www.mckinsey.com/insights/economic_studies/whats_driving_africas_growth
Lipset, Seymour Martin. 1959. “Some Social Requisites of Democracy: Economic Development and Political Legitimacy.” American Political Science Review, March. http://www.jstor.org/stable/1951731?seq=1#page_scan_tab_contents.
Luxembourg Income Study (LIS) Database, http://www.lisdatacenter.org (multiple countries; October 2014 to April 2015). Luxembourg: LIS.
Milanovic, Branko. 1999. “True World Income Distribution, 1988 and 1993: First Calculations, Based on Household Surveys Alone.” Washington, D.C.: World Bank, November. http://elibrary.worldbank.org/doi/book/10.1596/1813-9450-2244
Milanovic, Branko. 2011. The Haves and the Have-Nots. New York, NY: Basic Books.
Milanovic, Branko. 2014. “For Whom the Wall Fell? A Balance-Sheet of Transition to Capitalism.” Global Inequality, November. http://glineq.blogspot.com/2014/11/for-whom-wall-fell-balance-sheet-of.html
Milanovic, Branko, and Shlomo Yitzhaki. 2002. “Decomposing World Income Distribution: Does the World Have a Middle Class?” Review of Income and Wealth, June. http://www.roiw.org/2002/155.pdf
Murtin, Fabrice, and Romain Wacziarg. 2014. “The Democratic Transition.” Journal of Economic Growth, June. http://www.anderson.ucla.edu/faculty_pages/romain.wacziarg/downloads/transition.pdf
Orshansky, Mollie. 1965. “Counting the Poor: Another Look at the Poverty Profile.” Social Security Bulletin, January. http://www.ssa.gov/policy/docs/ssb/v28n1/v28n1p3.pdf
Ostry, Jonathan D., Andrew Berg and Charalambos G. Tsangarides. 2014. “Redistribution, Inequality, and Growth.” Washington, D.C.: International Monetary Fund, February. http://www.imf.org/external/pubs/ft/sdn/2014/sdn1402.pdf
Pew Research Center. 2012. “The Lost Decade of the Middle Class.” Washington, D.C.: August. https://www.pewresearch.org/social-trends/2012/08/22/the-lost-decade-of-the-middle-class/
Ravallion, Martin, Shaohua Chen and Prem Sangraula. 2009. “Dollar a Day Revisited.” Washington, D.C.: World Bank, June. http://elibrary.worldbank.org/doi/abs/10.1093/wber/lhp007
Savage, Mike, Fiona Devine, Niall Cunningham, Mark Taylor, Yaojun Li, Johs. Hjellbrekke, Brigitte Le Roux, Sam Friedman and Andrew Miles. 2013. “A New Model of Social Class: Findings from the BBC’s Great British Class Survey Experiment.” Sociology, April.
Sosa, Sebastian, and Evridiki Tsounta. 2013. “A Bumpy Road Ahead.” Finance & Development, September. http://www.imf.org/external/pubs/ft/fandd/2013/09/sosa.htm
Summers, Lawrence H., and Ed Balls. 2015. “Report of the Commission on Inclusive Prosperity.” Washington, D.C.: Center for American Progress, January. https://www.americanprogress.org/issues/economy/report/2015/01/15/104266/report-of-the-commission-on-inclusive-prosperity
U.S. Census Bureau. “Historical Income Tables: Households.” Washington, D.C. http://www.census.gov/hhes/www/income/data/historical/household/
U.S. Census Bureau. “Poverty Thresholds for 2011 by Size of Family and Number of Related Children Under 18 Years.” http://www.census.gov/hhes/www/poverty/data/threshld/index.html
U.S. Department of Agriculture, Center for Nutrition Policy and Promotion. 2011. “Official USDA Food Plans: Cost of Food at Home at Four Levels, U.S. Average, July 2011.” Alexandria, VA: August. http://www.cnpp.usda.gov/sites/default/files/usda_food_plans_cost_of_food/CostofFoodJul2011.pdf
U.S. National Intelligence Council. 2012. “Global Trends 2030: Alternative Worlds.” Washington, D.C., December. http://www.dni.gov/index.php/about/organization/global-trends-2030
Wilson, Dominic, and Raluca Dragusanu. 2008. “The Expanding Middle: The Exploding World Middle Class and Falling Global Inequality.” New York, NY: Goldman Sachs, July. http://www.ryanallis.com/wp-content/uploads/2008/07/expandingmiddle.pdf
Wignaraja, Ganeshan. 2011. “Economic Reforms, Regionalism, and Exports: Comparing China and India.” Honolulu: East-West Center. http://www.eastwestcenter.org/publications/economic-reforms-regionalism-and-exports-comparing-china-and-india
World Bank. 2007. “Global Economic Prospects: Managing the Next Wave of Globalization.” Washington, D.C. http://www.worldbank.org/content/dam/Worldbank/GEP/GEParchives/GEP2007/381400GEP2007.pdf
World Bank. 2008. “Global Purchasing Power Parities and Real Expenditures: 2005 International Comparison Program.” Washington, D.C. http://siteresources.worldbank.org/ICPINT/Resources/icp-final.pdf
World Bank. 2010. “Zambia: Accelerating and Sharing Growth through Improved Competitiveness.” Washington, D.C., October. http://siteresources.worldbank.org/IDA/Resources/73153-1285271432420/IDA_AT_WORK_Zambia.pdf
World Bank, 2014a. “Purchasing Power Parities and Real Expenditures of World Economies: Summary of Results and Findings of the 2011 International Comparison Program.” Washington, D.C. http://siteresources.worldbank.org/ICPINT/Resources/270056-1183395201801/Summary-of-Results-and-Findings-of-the-2011-International-Comparison-Program.pdf
World Bank, 2014b. “Kenya Economic Update: Take-off Delayed?” Washington, D.C., June. http://documents.worldbank.org/curated/en/2014/06/19768790/take-off-delayed-kenyas-economy-facing-headwinds-2014-special-focus-delivering-primary-health-care-services-vol-2-2
World Bank. 2015. “A Measured Approach to Ending Poverty and Boosting Shared Prosperity: Concepts, Data, and the Twin Goals.” Policy Research Report, Washington, D.C. http://www.worldbank.org/en/topic/measuringpoverty/publication/a-measured-approach-to-ending-poverty-and-boosting-shared-prosperity