How the World Survived the Population Bomb: Lessons From 50 Years of Extraordinary Demographic History

Abstract

The world population will reach 7 billion in late 2011, a demographic milestone that is causing renewed attention to the challenges caused by population growth. This article looks at the last 50 years of demographic change, one of the most extraordinary periods in demographic history. During this period, world population grew at rates that have never been seen before and will almost surely never be seen again. There were many concerns about the potential impact of rapid population growth in the 1960s, including mass starvation in countries such as India, depletion of nonrenewable resources, and increased poverty in low-income countries. The actual experience was very different. World food production increased faster than world population in every decade since the 1960s, resource prices fell during most of the period, and poverty declined significantly in much of the developing world. The article considers the economic and demographic explanations for the surprising successes of this important period in demographic history. It also looks at regions that have been less successful, especially Africa, and at the lessons for dealing with the important challenges that still remain.

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Notes

  1. 1.

    These trends will be documented and discussed in more detail later in the article.

  2. 2.

    For a history of the debate between Malthus and Godwin, see Petersen (1971).

  3. 3.

    McEvedy and Jones (1978) estimated that world population reached 2 billion in 1925, roughly consistent with other estimates compiled by the U.S. Census Bureau (2011) and the United Nations Population Division (1999).

  4. 4.

    Other frequently cited books that raised concerns about population growth include Famine 1975! (Paddock and Paddock 1967) and the Club of Rome’s Limits to Growth (Meadows 1972).

  5. 5.

    The doubling times in this paragraph are rough estimates based on the U.S. Census Bureau’s (2011) compilation of a number of historical estimates of world population.

  6. 6.

    The main source of population estimates and projections in this article is the 2010 Revision of World Population Prospects (United Nations Population Division 2011). Details about the assumptions in the low-, medium-, and high-variant projections are available at the United Nations Population Division (2011) website.

  7. 7.

    I use demographic transition to refer to empirical patterns in birth rates, death rates, and population growth rates, as in Lee (2003). For a discussion of the demographic transition as a theory of demographic change, see Kirk (1996).

  8. 8.

    The demographic transition for other regions and the world as a whole since 1950 are presented in Figs. A2 and A3 in Online Resource 1.

  9. 9.

    The food production data are based on the production index for food from the FAOSTAT online database (FAO 2011), converted to a base of 1961 = 100. As of June 2011, the index covered the period 1961 to 2009. The population estimates are from the United Nations Population Division (2011).

  10. 10.

    The results shown here are for total food production, but the trend for grains is very similar. The FAO’s cereals index grew at an average rate of 2.2% per year in the 1990s (FAO 2011).

  11. 11.

    Ehrlich’s perspective on this bet can be found in Ehrlich and Ehrlich (1996).

  12. 12.

    The latest milled rice exports by country from the FAOSTAT online database trade statistics are for 2008.

  13. 13.

    For a history of Borlaug’s life, see Hesser (2006). For overviews of the Green Revolution technologies, see Beddington (2010), Brown (1970), Cohen (1995), Dyson (1996), Evenson and Gollin (2003), and Glaeser (1987).

  14. 14.

    For a broad discussion of the debate regarding globalization, see Bhagwati (2007) and Stiglitz (2002).

  15. 15.

    Data on exports of goods and services as percentage of GDP are taken from World Development Indicators in the World Bank’s online World DataBank (World Bank 2011). Data on imports for these large aggregates of countries look almost identical.

  16. 16.

    These combine the proportions rural and urban in the most recent U.N. urbanization projections (United Nations Population Division 2009) with the 2010 population projections (United Nations Population Division 2011).

  17. 17.

    Pritchett’s paper generated considerable debate. See, for example, Bongaarts (1994), Casterline and El-Zeini (2007), Knowles et al. (1994), and Pritchett (1994b).

  18. 18.

    This section has benefited from helpful discussions with John Casterline, who also provided his estimates of the fertility measures used here.

  19. 19.

    Or, equivalently, the intercept of −0.028 means that 47% (0.028 / 0.060) of the decline in the TFR would have occurred in the absence of any decline in wanted fertility. Using the Casterline and El-Zeini (2007) measure of wanted fertility to decompose fertility change into a wanted and unwanted component for 44 countries, Casterline (2010) found that the median estimate is that 46% of the decline is due to a decline in wanted fertility, a result roughly consistent with the results in Table 1.

  20. 20.

    If it seems odd that mean family size was 8.5 at a time when the TFR was about 6, the explanation is provided in Sam Preston’s classic paper on family size of women and family size of children (Preston 1976). As Leticia Marteleto and I have shown, a good rule of thumb is that the mean family size for school-age children is about 40% larger than the TFR around the same time (Lam and Marteleto 2008b).

  21. 21.

    These data are from the U.S. National Aeronautics and Space Administration’s Goddard Institute for Space Studies (NASA 2011).

References

  1. Becker, G. S., & Lewis, H. G. (1973). Interaction between quantity and quality of children. Journal of Political Economy, 81, S279–S288.

    Article  Google Scholar 

  2. Beddington, J. (2010). Food security: Contributions from science to a new and greener revolution. Philosophical Transactions of the Royal Society B: Biological Sciences, 365, 61–71.

    Article  Google Scholar 

  3. Bhagwati, J. (2007). In defense of globalization (2nd ed.). New York: Oxford University Press.

    Google Scholar 

  4. Bloom, D., Canning, D., & Sevilla, J. (2003). The demographic dividend: A new perspective on the economic consequences of population change. Santa Monica, CA: RAND.

    Google Scholar 

  5. Bongaarts, J. (1990). The measurement of wanted fertility. Population and Development Review, 16, 487–506.

    Article  Google Scholar 

  6. Bongaarts, J. (1994). The impact of population policies: Comment. Population and Development Review, 20, 616–620.

    Article  Google Scholar 

  7. Bongaarts, J. (1996). Population pressure and the food supply system in the developing world. Population and Development Review, 22, 483–503.

    Article  Google Scholar 

  8. Bongaarts, J., & Bulatao, R. (Eds.). (2000). Beyond six billion: Forecasting the world’s population. Washington, DC: Panel on Population Projections, Committee on Population, Commission on Behavioral and Social Sciences and Education, National Research Council.

    Google Scholar 

  9. Boserup, E. (1981). Population and technological change: A study of long-term trends. Chicago, IL: University of Chicago.

    Google Scholar 

  10. Brown, L. R. (1970). Seeds of change: The Green Revolution and development in the 1970’s. New York: Praeger Publishers.

    Google Scholar 

  11. Brown, L. R. (1981). World population growth, soil erosion, and food security. Science, 214, 995–1002.

    Article  Google Scholar 

  12. Caldwell, J., & Caldwell, P. (1986). Limiting population growth and the Ford Foundation contribution. London, UK: F. Pinter.

    Google Scholar 

  13. Casterline, J. (2010). Wanted fertility, unwanted fertility, and fertility decline: A fresh assessment. Paper presented at 2010 meeting of Population Association of America, Dallas, TX.

  14. Casterline, J., & El-Zeini, L. (2007). The estimation of unwanted fertility. Demography, 44, 729–745.

    Article  Google Scholar 

  15. Che, T. N., Kompas, T., & Vousden, N. (2006). Market reform, incentives and economic development in Vietnamese rice production. Comparative Economic Studies, 48, 277–301.

    Article  Google Scholar 

  16. Chen, S. H., & Ravallion, M. (2010). The developing world is poorer than we thought, but no less successful in the fight against poverty. Quarterly Journal of Economics, 125, 1577–1625.

    Article  Google Scholar 

  17. Cohen, J. E. (1995). How many people can the Earth support. New York: W.W. Norton.

    Google Scholar 

  18. Deaton, A. (2010). Price indexes, inequality, and the measurement of world poverty. American Economic Review, 100, 5–34.

    Article  Google Scholar 

  19. Demographic and Health Surveys. (2011). Data sets for individual countries. Retrieved from http://www.measuredhs.com

  20. Donaldson, P. (1990). Nature against us: The United States and the world population crisis, 1965–1980. Chapel Hill: University of North Carolina Press.

    Google Scholar 

  21. Dyson, T. (1996). Population and food: Global trends and future prospects. London, UK, and New York: Routledge.

    Google Scholar 

  22. The Economist. (2011, Feb. 24). The future of food. Retrieved from http://www.economist.com/node/18229412

  23. Ehrlich, P. R. (1968). The population bomb. New York: Ballantine Books.

    Google Scholar 

  24. Ehrlich, P. R., & Ehrlich, A. H. (1990). The population explosion. New York: Simon & Schuster.

    Google Scholar 

  25. Ehrlich, P. R., & Ehrlich, A. H. (1996). Betrayal of science and reason: How anti-environmental rhetoric threatens our future. Washington, DC: Island Press.

    Google Scholar 

  26. Evenson, R. E., & Gollin, D. (2003). Assessing the impact of the Green Revolution, 1960 to 2000. Science, 300, 758–762.

    Article  Google Scholar 

  27. Food and Agriculture Organization (FAO). (2011). FAOSTAT online database. Retrieved from http://faostat.fao.org

  28. Freedman, R., & Blanc, A. K. (1992). Fertility transition: An update. International Family Planning Perspectives, 18, 44–50.

    Article  Google Scholar 

  29. Gillis, J. (2011, June 4). A warming planet struggles to feed itself. The New York Times, p. A1.

  30. Glaeser, B. (1987). The Green Revolution revisited: Critique and alternatives. London, UK: Allen & Unwin.

    Google Scholar 

  31. Glaeser, E. (2011). Triumph of the city: How our greatest invention makes us richer, smarter, greener, healthier, and happier. New York: Penguin Press.

    Google Scholar 

  32. Godwin, W. (1793/1798). Enquiry concerning political justice, and its influence on morals and happiness (3rd edition corrected, two volumes). London, UK: printed for G. G. and J. Robinson.

  33. Guus, J., Velders, M., Andersen, S. O., Daniel, J. S., Fahey, D. W., & McFarland, M. (2007). The importance of the Montreal Protocol in protecting climate. Proceedings of the National Academy of Science, 104, 4814–4819.

    Article  Google Scholar 

  34. Hesser, L. F. (2006). The man who fed the world: Nobel Peace Prize laureate Norman Borlaug and his battle to end world hunger: An authorized biography. Dallas, TX: Durban House Publishing Company, Inc.

    Google Scholar 

  35. Jevons, W. S. (1866). The coal question. London, UK: Macmillan and Co.

    Google Scholar 

  36. Johnson, D. G. (2000). Population, food, and knowledge. American Economic Review, 90, 1–14.

    Article  Google Scholar 

  37. Jones, R., Kierzkowski, H., & Lurong, C. (2005). What does evidence tell us about fragmentation and outsourcing? International Review of Economics & Finance, 14, 305–316.

    Article  Google Scholar 

  38. Joshi, S., & Schultz, T. P. (2007). Family planning as an investment in development: Evaluation of a program’s consequences in Matlab, Bangladesh (Discussion Paper No. 951). New Haven, CT: Yale University Economic Growth Center.

  39. Kelly, T. D., & Matos, G. R. (2010). Historical statistics for mineral and material commodities in the United States, Version 2010 [Data file]. Retrieved from http://minerals.usgs.gov/ds/2005/140/

  40. Kinsella, K., & Velkoff, V. (2001). An aging world: 2001 (U.S. Census Bureau Series P95/01-1). Washington, DC: U.S. Government Printing Office.

  41. Kirk, D. (1996). Demographic transition theory. Population Studies, 50, 361–387.

    Article  Google Scholar 

  42. Knowles, J. C., Akin, J. S., & Guilkey, D. K. (1994). The impact of population policies: Comment. Population and Development Review, 20, 611–615.

    Article  Google Scholar 

  43. Kremer, M. (1993). Population growth and technological change: One million B.C. to 1990. Quarterly Journal of Economics, 108, 681–716.

    Article  Google Scholar 

  44. Lam, D. (2005). How the world survived the population bomb: An economic perspective. In S. Asefa (Ed.), The economics of sustainable development (pp. 99–132). Kalamazoo, MI: W.E. Upjohn Institute for Employment Research.

    Google Scholar 

  45. Lam, D., Ardington, C., Branson, N., Case, A., Leibbrandt, M., Menendez, A., . . . Sparks, M. (2008, October). The Cape Area Panel Study: Overview and technical documentation of Waves 1-2-3-4. Cape Town, South Africa: The University of Cape Town.

  46. Lam, D., Ardington, C., & Leibbrandt, M. (2011). Schooling as a lottery: Radical differences in school advancement in urban South Africa. Journal of Development Economics, 95, 121–136.

    Article  Google Scholar 

  47. Lam, D., Branson, N., Leibbrandt, M., & Goostrey, K. (2010a, April). Credit constraints and the racial gap in post-secondary education in South Africa. Paper presented at annual meeting of Population Association of America, Dallas, TX.

  48. Lam, D., & Duryea, S. (1999). Effects of schooling on fertility, labor supply, and investments in children, with evidence from Brazil. Journal of Human Resources, 34, 160–192.

    Article  Google Scholar 

  49. Lam, D., Leibbrandt, M., & Mlatsheni, C. (2010b, April/May). Human capital, job search, and unemployment among young people in South Africa. Paper presented at 2010 meeting of Population Association of America, Dallas, TX.

  50. Lam, D., & Marteleto, L. (2008a). Stages of the demographic transition from a child’s perspective: Family size, cohort size, and children’s resources. Population and Development Review, 34, 225–252.

    Article  Google Scholar 

  51. Lam, D., & Marteleto, L. (2008b, April). Family size of women and children during the demographic transition. Paper presented at the annual meeting of the Population Association of America, New Orleans, LA.

  52. Lam, D., Marteleto, L., & Ranchhod, V. (2009, April/May). Schooling and sexual behavior in South Africa: The role of peer effects. Paper presented at the annual meeting of the Population Association of America, Detroit, MI.

  53. Lee, R. D. (1988). Induced population growth and induced technological progress: Their interaction in the accelerating stage. Mathematical Population Studies: An International Journal of Mathematical Demography, 1, 265–288.

    Article  Google Scholar 

  54. Lee, R. D. (1997). Population dynamics: Equilibrium, disequilibrium, and consequences of fluctuations. In M. R. Rosenzweig, & O. Stark (Eds.), Handbook of population and family economics (pp. 1063–1115). Amsterdam, The Netherlands: Elsevier.

  55. Lee, R. D. (2003). The demographic transition: Three centuries of fundamental change. Journal of Economic Perspectives, 17, 167–190.

    Article  Google Scholar 

  56. Lutz, W., Sanderson, W., & Scherbov, S. (1997). Doubling of world population unlikely. Nature, 387, 803–805.

    Article  Google Scholar 

  57. Lutz, W., Sanderson, W., & Scherbov, S. (2001). The end of world population growth. Nature, 412, 543–545.

    Article  Google Scholar 

  58. Lutz, W., Sanderson, W. C., & Scherbov, S. (2004). The end of world population growth in the 21st century: New challenges for human capital formation and sustainable development. London, UK, and Sterling, VA: Earthscan.

    Google Scholar 

  59. Malthus, T. R. (1803/1960). An essay on population. London, UK, and New York: Dent; Dutton.

  60. Martine, G. (1996). Brazil’s fertility decline, 1965–95: A fresh look at key factors. Population and Development Review, 22, 47–75.

    Article  Google Scholar 

  61. Mason, K. O. (1997). Explaining fertility transitions. Demography, 34, 443–454.

    Article  Google Scholar 

  62. McEvedy, C., & Jones, R. (1978). Atlas of world population history. New York: Penguin Books.

    Google Scholar 

  63. Meadows, D. H. (1972). The limits to growth: A report for the Club of Rome’s project on the predicament of mankind. New York: Universe Books.

    Google Scholar 

  64. Minnesota Population Center. (2011). Integrated Public Use Microdata Series, International: Version 6.1 [Machine-readable database]. Minneapolis: University of Minnesota. Retrieved from https://international.ipums.org/international/index.shtml

  65. National Aeronautics and Space Administration (NASA). (2011). GISS Surface Temperature Analysis, Global mean monthly temperature data. Retrieved from http://data.giss.nasa.gov/gistemp/tabledata/GLB.Ts+dSST.txt

  66. National Research Council. (1986). Population growth and economic development: Policy questions. Washington, DC: National Academy Press.

    Google Scholar 

  67. Paddock, W., & Paddock, P. (1967). Famine, 1975! America’s decision: Who will survive. Boston, MA: Little, Brown.

    Google Scholar 

  68. Panel on Urban Development, National Research Council. (2003). In M. R. Montgomery, R. Stren, R. Cohen, & H. E. Reed (Eds.), Cities transformed: Demographic change and its implications in the developing world. Washington, DC: National Academies Press.

    Google Scholar 

  69. Petersen, W. (1971). The Malthus-Godwin Debate, then and now. Demography, 8, 13–26.

    Article  Google Scholar 

  70. Pingali, P. L., & Xuan, V. T. (1992). Vietnam: Decollectivization and rice productivity growth. Economic Development and Cultural Change, 40, 697–718.

    Article  Google Scholar 

  71. Potter, J., Schmertmann, C., & Cavenaghi, S. (2002). Fertility and development: Evidence from Brazil. Demography, 39, 739–761.

    Article  Google Scholar 

  72. Preston, S. H. (1976). Family sizes of children and family sizes of women. Demography, 13, 105–114.

    Article  Google Scholar 

  73. Pritchett, L. H. (1994a). Desired fertility and the impact of population policies. Population and Development Review, 20, 1–55.

    Article  Google Scholar 

  74. Pritchett, L. H. (1994b). The impact of population policies: Reply. Population and Development Review, 20, 621–630.

    Article  Google Scholar 

  75. Schultz, T. P. (1993). Returns to women’s education. In M. A. Hill & E. M. King (Eds.), Women’s education in developing countries. New York: Oxford University Press for The World Bank.

    Google Scholar 

  76. Simon, J. (1981). The ultimate resource. Princeton, NJ: Princeton University Press.

    Google Scholar 

  77. Simon, J. (1986). Theory of population and economic growth. Oxford, UK: Blackwell.

    Google Scholar 

  78. Simon, J. (1996). The ultimate resource (2nd ed.). Princeton, NJ: Princeton University Press.

    Google Scholar 

  79. Smith, S. J., van Aardenne, J., Klimont, Z., Andres, R. J., Volke, A., & Delgado Arias, S. (2011). Anthropogenic sulfur dioxide emissions: 1850–2005. Atmospheric Chemistry and Physics, 11, 1101–1116.

    Article  Google Scholar 

  80. Stiglitz, J. E. (2002). Globalization and its discontents. New York: W. W. Norton.

    Google Scholar 

  81. Tierney, J. (1990, Dec. 2). Betting the planet. New York Times Magazine. Retrieved from http://www.nytimes.com/1990/12/02/magazine/betting-on-the-planet.html

  82. Time Magazine. (1960, Jan. 11). Population: The numbers game.

  83. United Nations Population Division. (1999). The world at six billion. Retrieved from http://www.un.org/esa/population/publications/sixbillion/

  84. United Nations Population Division. (2009). World urbanization prospects: The 2009 revision [Database]. Retrieved from http://esa.un.org/unpd/wup/index.htm

  85. United Nations Population Division. (2011). World population prospects: The 2010 revision [Database]. Retrieved from http://esa.un.org/unpd/wpp/index.htm

  86. U.S. Census Bureau. (2010). Total midyear population for the world: 1950–2050 [Data updated Dec. 20, 2010]. Retrieved from http://www.census.gov/population/international/data/idb/worldpoptotal.php

  87. U.S. Census Bureau. (2011). Historical estimates of world population. Retrieved from http://www.census.gov/population/international/data/idb/worldhis.php

  88. Willis, R. J. (1973). New approach to economic theory of fertility behavior. Journal of Political Economy, 81, S14–S64.

    Article  Google Scholar 

  89. World Bank. (2011). World DataBank [Database]. Retrieved from http://databank.worldbank.org/ddp/home.do

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Acknowledgments

This is a revised version of the presidential address presented at the annual meeting of the Population Association of America on April 1, 2011, in Washington, D.C. The article draws on previous work, including Lam (2005), Lam and Duryea (1999), and Lam and Marteleto (2008a). Excellent research assistance was provided by Kendra Goostrey and Laura Zimmermann. Valuable comments were provided by many of my colleagues at the University of Michigan and by two anonymous reviewers. Financial support for the research that is presented here was provided by the Eunice Kennedy Shriver National Institute of Child Health and Human Development, the William and Flora Hewlett Foundation, and the Andrew W. Mellon Foundation.

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Lam, D. How the World Survived the Population Bomb: Lessons From 50 Years of Extraordinary Demographic History. Demography 48, 1231–1262 (2011). https://doi.org/10.1007/s13524-011-0070-z

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Keywords

  • Population growth
  • Demographic transition
  • Poverty
  • Resources
  • Food