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Progress and Challenges in Global Food Security

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  • Christensen, Cheryl

Abstract

The United States leads efforts to improve global food security, providing about half of global food aid. Global food security has improved over the past 15 years, but challenges and opportunities remain. ERS researchers recently analyzed the roles of trade, agricultural productivity, safety nets, and better data and measurement in achieving these gains.

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  • Christensen, Cheryl, 2018. "Progress and Challenges in Global Food Security," Amber Waves:The Economics of Food, Farming, Natural Resources, and Rural America, United States Department of Agriculture, Economic Research Service, vol. 0(01), February.
    • Handle: RePEc:ags:uersaw:302501
    DOI: 10.22004/ag.econ.302501
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    1. Seema Jayachandran & Rohini Pande, 2015. "Why Are Indian Children So Short?," NBER Working Papers 21036, National Bureau of Economic Research, Inc.
    2. Dean Karlan & Robert Osei & Isaac Osei-Akoto & Christopher Udry, 2014. "Agricultural Decisions after Relaxing Credit and Risk Constraints," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 129(2), pages 597-652.
    3. Aker,Jenny C., 2015. "Comparing cash and voucher transfers in a humanitarian context : evidence from the Democratic Republic of Congo," Policy Research Working Paper Series 7469, The World Bank.
    4. Eric V. Edmonds & Nina Pavcnik & Petia Topalova, 2010. "Trade Adjustment and Human Capital Investments: Evidence from Indian Tariff Reform," American Economic Journal: Applied Economics, American Economic Association, vol. 2(4), pages 42-75, October.
    5. Davis, Benjamin & Handa, Sudhanshu & Hypher, Nicola & Winder Rossi, Natalia & Winters, Paul & Yablon (ed.), 2016. "From Evidence to Action: The Story of Cash Transfers and Impact Evaluation in Sub Saharan Africa," OUP Catalogue, Oxford University Press, number 9780198769446.
    6. Douglas Gollin & Remi Jedwab & Dietrich Vollrath, 2016. "Urbanization with and without industrialization," Journal of Economic Growth, Springer, vol. 21(1), pages 35-70, March.
    7. Luc Christiaensen & Lionel Demery & Jesper Kühl, 2010. "The (Evolving) Role of Agriculture in Poverty Reduction," WIDER Working Paper Series wp-2010-036, World Institute for Development Economic Research (UNU-WIDER).
    8. Cochrane, Nancy & D'Souza, Anna, 2015. "Measuring Access to Food in Tanzania: A Food Basket Approach," Amber Waves:The Economics of Food, Farming, Natural Resources, and Rural America, United States Department of Agriculture, Economic Research Service, issue 02, pages 1-13, March.
    9. Gaurav Datt & Martin Ravallion, 1998. "Farm productivity and rural poverty in India," Journal of Development Studies, Taylor & Francis Journals, vol. 34(4), pages 62-85.
    10. Beaman, Lori & Dillon, Andrew, 2012. "Do household definitions matter in survey design? Results from a randomized survey experiment in Mali," Journal of Development Economics, Elsevier, vol. 98(1), pages 124-135.
    11. Joanna B. Upton & Jennifer Denno Cissé & Christopher B. Barrett, 2016. "Food security as resilience: reconciling definition and measurement," Agricultural Economics, International Association of Agricultural Economists, vol. 47(S1), pages 135-147, November.
    12. World Bank, 2003. "Vietnam Development Report 2004 : Poverty," World Bank Publications - Reports 14651, The World Bank Group.
    13. Fuglie, Keith O. & Rada, Nicholas E., 2013. "Resources, Policies, and Agricultural Productivity in Sub-Saharan Africa," Economic Research Report 145368, United States Department of Agriculture, Economic Research Service.
    14. Kuyvenhoven, Arie, 2004. "Creating an enabling environment: policy conditions for less-favored areas," Food Policy, Elsevier, vol. 29(4), pages 407-429, August.
    15. Dean Spears & Arabinda Ghosh & Oliver Cumming, 2013. "Open Defecation and Childhood Stunting in India: An Ecological Analysis of New Data from 112 Districts," PLOS ONE, Public Library of Science, vol. 8(9), pages 1-1, September.
    16. Smith, Lisa C. & Haddad, Lawrence James, 2000. "Explaining child malnutrition in developing countries: a cross-country analysis," Research reports 111, International Food Policy Research Institute (IFPRI).
    17. Tandon, Sharad & Landes, Maurice R., 2012. "Estimating the Range of Food-Insecure Households in India," Economic Research Report 262230, United States Department of Agriculture, Economic Research Service.
    18. Benhabib, Jess & Spiegel, Mark M., 2005. "Human Capital and Technology Diffusion," Handbook of Economic Growth, in: Philippe Aghion & Steven Durlauf (ed.), Handbook of Economic Growth, edition 1, volume 1, chapter 13, pages 935-966, Elsevier.
    19. Gentilini, Ugo, 2014. "Our daily bread : what is the evidence on comparing cash versus food transfers?," Social Protection Discussion Papers and Notes 89502, The World Bank.
    20. Maxwell, Daniel, 1999. "The Political Economy of Urban Food Security in Sub-Saharan Africa," World Development, Elsevier, vol. 27(11), pages 1939-1953, November.
    21. Petia Topalova, 2010. "Factor Immobility and Regional Impacts of Trade Liberalization: Evidence on Poverty from India," American Economic Journal: Applied Economics, American Economic Association, vol. 2(4), pages 1-41, October.
    22. Feder, Gershon & Just, Richard E & Zilberman, David, 1985. "Adoption of Agricultural Innovations in Developing Countries: A Survey," Economic Development and Cultural Change, University of Chicago Press, vol. 33(2), pages 255-298, January.
    23. Magrini, Emiliano & Montalbano, Pierluigi & Nenci, Silvia & Salvatici, Luca, 2014. "Agricultural Trade Policy Distortions and Food Security: Is there a Causal Relationship?," 2014 Third Congress, June 25-27, 2014, Alghero, Italy 173091, Italian Association of Agricultural and Applied Economics (AIEAA).
    24. Lisa Hjelm & UNICEF Office of Research - Innocenti, 2016. "The Impact of Cash Transfers on Food Security," Papers inores800, Innocenti Research Briefs.
    25. Tarozzi, Alessandro, 2005. "The Indian Public Distribution System as provider of food security: Evidence from child nutrition in Andhra Pradesh," European Economic Review, Elsevier, vol. 49(5), pages 1305-1330, July.
    26. Emiliano Magrini & Pierluigi Montalbano & Silvia Nenci & Luca Salvatici, 2017. "Agricultural (Dis)Incentives and Food Security: Is There a Link?," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 99(4), pages 847-871.
    27. Marc F. Bellemare, 2015. "Rising Food Prices, Food Price Volatility, and Social Unrest," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 97(1), pages 1-21.
    28. Tesliuc, Cornelia & Smith, W. James & Sunkutu, Musonda Rosemary, 2013. "Zambia - Using social safety nets to accelerate poverty reduction and share prosperity," Social Protection Discussion Papers and Notes 89708, The World Bank.
    29. Beegle, Kathleen & De Weerdt, Joachim & Friedman, Jed & Gibson, John, 2012. "Methods of household consumption measurement through surveys: Experimental results from Tanzania," Journal of Development Economics, Elsevier, vol. 98(1), pages 3-18.
    30. Nicholas E. Rada & Steven T. Buccola & Keith O. Fuglie, 2010. "Government Policy and Agricultural Productivity in Indonesia," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 93(3), pages 863-880.
    31. Tandon, Sharad & Landes, Maurice, 2014. "India Continues To Grapple With Food Insecurity," Amber Waves:The Economics of Food, Farming, Natural Resources, and Rural America, United States Department of Agriculture, Economic Research Service, issue 01, pages 1-1, February.
    32. Alem, Yonas & Söderbom, Måns, 2012. "Household-Level Consumption in Urban Ethiopia: The Effects of a Large Food Price Shock," World Development, Elsevier, vol. 40(1), pages 146-162.
    33. Anna D’Souza & Sharad Tandon, 2019. "Intrahousehold Nutritional Inequities in Rural Bangladesh," Economic Development and Cultural Change, University of Chicago Press, vol. 67(3), pages 625-657.
    34. Abhijeet Singh & Albert Park & Stefan Dercon, 2014. "School Meals as a Safety Net: An Evaluation of the Midday Meal Scheme in India," Economic Development and Cultural Change, University of Chicago Press, vol. 62(2), pages 275-306.
    35. Robert T. Jensen & Nolan H. Miller, 2011. "Do Consumer Price Subsidies Really Improve Nutrition?," The Review of Economics and Statistics, MIT Press, vol. 93(4), pages 1205-1223, November.
    36. Beegle, Kathleen & Himelein, Kristen & Ravallion, Martin, 2012. "Frame-of-reference bias in subjective welfare," Journal of Economic Behavior & Organization, Elsevier, vol. 81(2), pages 556-570.
    37. United Nations UN, 2015. "Transforming our World: the 2030 Agenda for Sustainable Development," Working Papers id:7559, eSocialSciences.
    38. Janet Currie & Firouz Gahvari, 2008. "Transfers in Cash and In-Kind: Theory Meets the Data," Journal of Economic Literature, American Economic Association, vol. 46(2), pages 333-383, June.
    39. Rada, Nicholas E. & Valdes, Constanza, 2012. "Policy, Technology, and Efficiency of Brazilian Agriculture," Economic Research Report 127498, United States Department of Agriculture, Economic Research Service.
    40. Jedwab,Remi Camille & Christiaensen,Luc & Gindelsky,Marina, 2015. "Demography, urbanization and development : rural push, urban pull and... urban push ?," Policy Research Working Paper Series 7333, The World Bank.
    41. Fuglie, Keith & Rada, Nicholas, 2013. "Growth in Global Agricultural Productivity: An Update," Amber Waves:The Economics of Food, Farming, Natural Resources, and Rural America, United States Department of Agriculture, Economic Research Service, issue 10, pages 1-1, November.
    42. Hidrobo, Melissa & Hoddinott, John & Peterman, Amber & Margolies, Amy & Moreira, Vanessa, 2014. "Cash, food, or vouchers? Evidence from a randomized experiment in northern Ecuador," Journal of Development Economics, Elsevier, vol. 107(C), pages 144-156.
    43. Martin Ravallion & Kristen Himelein & Kathleen Beegle, 2016. "Can Subjective Questions on Economic Welfare Be Trusted?," Economic Development and Cultural Change, University of Chicago Press, vol. 64(4), pages 697-726.
    44. Emiliano Magrini & Pierluigi Montalbano & Silvia Nenci & Luca Salvatici, 2014. "Agricultural Trade Policies and Food Security: Is there a Causal Relationship?," Working Papers 9/14, Sapienza University of Rome, DISS.
    45. John Gibson & Kathleen Beegle & Joachim De Weerdt & Jed Friedman, 2015. "What does Variation in Survey Design Reveal about the Nature of Measurement Errors in Household Consumption?," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 77(3), pages 466-474, June.
    46. Díaz-Bonilla, Eugenio, 2015. "Macroeconomics, agriculture, and food security: A guide to policy analysis in developing countries," IFPRI books, International Food Policy Research Institute (IFPRI), number 978-0-89629-859-0.
    47. Minot, Nicholas, 2014. "Food price volatility in sub-Saharan Africa: Has it really increased?," Food Policy, Elsevier, vol. 45(C), pages 45-56.
    48. Sendhil Mullainathan & Marianne Bertrand, 2001. "Do People Mean What They Say? Implications for Subjective Survey Data," American Economic Review, American Economic Association, vol. 91(2), pages 67-72, May.
    49. Kilelu, Catherine W. & Klerkx, Laurens & Leeuwis, Cees, 2013. "Unravelling the role of innovation platforms in supporting co-evolution of innovation: Contributions and tensions in a smallholder dairy development programme," Agricultural Systems, Elsevier, vol. 118(C), pages 65-77.
    50. Yanikkaya, Halit, 2003. "Trade openness and economic growth: a cross-country empirical investigation," Journal of Development Economics, Elsevier, vol. 72(1), pages 57-89, October.
    51. Kochar, Anjini, 2005. "Can Targeted Food Programs Improve Nutrition? An Empirical Analysis of India's Public Distribution System," Economic Development and Cultural Change, University of Chicago Press, vol. 54(1), pages 203-235, October.
    52. D'Souza, Anna & Tandon, Sharad, 2015. "Using Household and Intrahousehold Data To Assess Food Insecurity: Evidence from Bangladesh," Economic Research Report 262207, United States Department of Agriculture, Economic Research Service.
    53. Díaz-Bonilla, Eugenio, 2015. "Synopsis: Macroeconomics, agriculture, and food security: A guide to policy analysis in developing countries:," Issue briefs 87, International Food Policy Research Institute (IFPRI).
    54. Minten, Bart & Barrett, Christopher B., 2008. "Agricultural Technology, Productivity, and Poverty in Madagascar," World Development, Elsevier, vol. 36(5), pages 797-822, May.
    55. Alston, Julian M. & Wyatt, T. J. & Pardey, Philip G. & Marra, Michele C. & Chan-Kang, Connie, 2000. "A meta-analysis of rates of return to agricultural R & D: ex pede Herculem?," Research reports 113, International Food Policy Research Institute (IFPRI).
    56. Foster, Andrew D & Rosenzweig, Mark R, 2004. "Agricultural Productivity Growth, Rural Economic Diversity, and Economic Reforms: India, 1970-2000," Economic Development and Cultural Change, University of Chicago Press, vol. 52(3), pages 509-542, April.
    57. Reardon, Thomas, 1997. "Using evidence of household income diversification to inform study of the rural nonfarm labor market in Africa," World Development, Elsevier, vol. 25(5), pages 735-747, May.
    58. Jedwab, Remi & Christiaensen, Luc & Gindelsky, Marina, 2017. "Demography, urbanization and development: Rural push, urban pull and…urban push?," Journal of Urban Economics, Elsevier, vol. 98(C), pages 6-16.
    59. Tandon, Sharad & Landes, Maurice R., 2011. "The Response of Consumption to Income Shocks: Evidence from the Indian Trade Liberalization," 2011 Annual Meeting, July 24-26, 2011, Pittsburgh, Pennsylvania 103767, Agricultural and Applied Economics Association.
    60. Broussard, Nzinga H. & Tandon, Sharad, 2016. "Food Insecurity Measures: Experience-Based Versus Nutrition-Based Evidence From India, Bangladesh, and Ethiopia," Economic Research Report 262189, United States Department of Agriculture, Economic Research Service.
    61. Tembo, Solomon & Sitko, Nicholas, 2013. "Technical Compendium: Descriptive Agricultural Statistics and Analysis for Zambia," Food Security Collaborative Working Papers 155988, Michigan State University, Department of Agricultural, Food, and Resource Economics.
    62. Wang, Sun Ling & Heisey, Paul & Schimmelpfennig, David & Ball, Eldon, 2015. "Agricultural Productivity Growth in the United States: Measurement, Trends, and Drivers," Economic Research Report 207954, United States Department of Agriculture, Economic Research Service.
    63. Glewwe, Paul & Miguel, Edward A., 2008. "The Impact of Child Health and Nutrition on Education in Less Developed Countries," Handbook of Development Economics, in: T. Paul Schultz & John A. Strauss (ed.), Handbook of Development Economics, edition 1, volume 4, chapter 56, pages 3561-3606, Elsevier.
    64. Janzen, Sarah A. & Carter, Michael R. & Ikegami, Munenobu, 2012. "Valuing Asset Insurance in the Presence of Poverty Traps: A Dynamic Approach," 2012 Annual Meeting, August 12-14, 2012, Seattle, Washington 124805, Agricultural and Applied Economics Association.
    65. Caeyers, Bet & Chalmers, Neil & De Weerdt, Joachim, 2012. "Improving consumption measurement and other survey data through CAPI: Evidence from a randomized experiment," Journal of Development Economics, Elsevier, vol. 98(1), pages 19-33.
    66. Eugenio Diaz-Bonilla & David Orden & Andrzej Kwieciński, 2014. "Enabling Environment for Agricultural Growth and Competitiveness: Evaluation, Indicators and Indices," OECD Food, Agriculture and Fisheries Papers 67, OECD Publishing.
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    4. Jong Eun Park & So Young Kim & Se Hee Kim & Eun Ju Jeoung & Jong Hyock Park, 2020. "Household Food Insecurity: Comparison between Families with and without Members with Disabilities," IJERPH, MDPI, vol. 17(17), pages 1-16, August.

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