Income inequality and health: A causal review

Social Science and Medicine

Volumn 128, Issue , 2015, Pages 316-326

  Pickett, Kate E ^a   Wilkinson, Richard G ^b  

^a UNIVERSITY OF YORK   (United Kingdom)

^b UNIVERSITY OF NOTTINGHAM   (United Kingdom)

Author keywords

Causality; Income distribution; Population health; Review

Indexed keywords

HEALTH STATUS; INCOME DISTRIBUTION; SOCIOECONOMIC INDICATOR; SOCIOECONOMIC STATUS;

ADOLESCENT PREGNANCY; DEVELOPING COUNTRY; EDUCATIONAL STATUS; HEALTH; HEALTH HAZARD; HOMICIDE; HUMAN; INCOME; INCOME INEQUALITY; INFANT MORTALITY; LIFE EXPECTANCY; LOWEST INCOME GROUP; MENTAL DISEASE; OBESITY; PRISON; REVIEW; SOCIAL CLASS; THEORY VALIDATION; WELLBEING; HEALTH STATUS;

GLOBAL HEALTH; HEALTH STATUS; HUMANS; INCOME; SOCIAL CLASS;

EID: 84922225715     PISSN: 02779536     EISSN: 18735347     Source Type: Journal    
DOI: 10.1016/j.socscimed.2014.12.031     Document Type: Review

References (140)

1. Adler N.E., Epel E.S., Castellazzo G., Ickovics J.R. Relationship of subjective and objective social status with psychological and physiological functioning: preliminary data in healthy white women. Health Psychol. 2000, 19:586-592.
2. Aittomaki A., Martikainen P., Rahkonen O., Lahelma E. Household income and health problems during a period of labour-market change and widening income inequalities - a study among the Finnish population between 1987 and 2007. Soc. Sci. Med. 2014, 100:84-92.
3. Andersen R., Curtis J. The polarizing effect of economic inequality on class identification: evidence from 44 countries. Res. Soc. Stratif. Mobil. 2012, 30:129-141.
4. Ash M., Robinson D.E. Inequality, race, and mortality in U.S. cities: a political and econometric review of Deaton and Lubotsky (56:6, 1139-1153, 2003). Soc. Sci. Med. 2009, 68:1909-1913.
5. Auger N., Hamel D., Martinez J., Ross N.A. Mitigating effect of immigration on the relation between income inequality and mortality: a prospective study of 2 million Canadians. J.Epidemiol. Community Health 2012, 66:e5.
6. Babones S.J. Income inequality and population health: correlation and causality. Soc. Sci. Med. 2008, 66:1614-1626.
7. Barford A., Dorling D., Pickett K. Re-evaluating self-evaluation. A commentary on Jen, Jones, and Johnston (68:4, 2009). Soc. Sci. Med. 2010, 70:496-497. Discussion 498-500.
8. Bezruchka S., Namekata T., Sistrom M.G. Improving economic Equality and health: the case of Postwar Japan. Am. J. Public Health 2008, 98:216-221.
9. Bhopal R.S. Concepts of Epidemiology: an Integrated Introduction to the Ideas, Theories, Principles and Methods of Epidemiology 2002, Oxford University Press Oxford.
10. Biggs B., King L., Basu S., Stuckler D. Is wealthier always healthier? The impact of national income level, inequality, and poverty on public health in Latin America. Soc. Sci. Med. 2013, 71:266-273.
11. Bird P.K. Social Gradients in Child Health and Development in Relation to Income Inequality. Who Benefits from Greater Income Equality? Health Sciences 2014, University of York, York.
12. Burns J.K., Tomita A., Kapadia A.S. Income inequality and schizophrenia: increased schizophrenia incidence in countries with high levels of income inequality. Int. J. Soc. Psychiatry 2014, 60:185-196.
13. Burrows S., Laflamme L. Socioeconomic disparities and attempted suicide: state of knowledge and implications for research and prevention. Int. J. Inj. Control Saf. Promot. 2010, 17:23-40.
14. Cameron D. Hugo Young Lecture 2009, (accessed 05.12.14.). http://www.respublica.org.uk/item/ResPublica-mentioned-in-Camerons-speech-ggtc.
15. Chemi E.G. The Pay-for-performance Myth 2014, http://www.businessweek.com/articles/2014-07-22/for-ceos-correlation-between-pay-and-stock-performance-is-pretty-random.
16. Chen Z., Gotway Crawford C.A. The role of geographic scale in testing the income inequality hypothesis as an explanation of health disparities. Soc. Sci. Med. 2012, 75:1022-1031.
17. Clarkwest A. Neo-materialist theory and the temporal relationship between income inequality and longevity change. Soc. Sci. Med. 2008, 66:1871-1881.
18. Cohen S., Doyle W.J., Skoner D.P., Rabin B.S., Gwaltney J.M. Social ties and susceptibility to the common cold. J.Am. Med. Assoc. 1997, 277:1940-1944.
19. Cutler D., Deaton A., Lleras-Muney A. The determinants of mortality. J.Econ. Perspect. 2006, 20:97-120.
20. Daly M., Wilson M. Cultural inertia, economic incentives, and the persistence of "southern violence". Evolution, Culture, and the Human Mind 2010, Psychology Press, New York, NY. M. Schaller, A. Norenzayan, S. Heine, T. Yamagishi, T. Kameda (Eds.).
21. Daly M., Wilson M., Vasdev S. Income inequality and homicide rates in Canada and the United States. Can. J. Public Health Revue Can. Crim. 2001, 43:219-236.
22. Daly M.C., Oswald A.J., Wilson D., Wu S. Dark contrasts: the paradox of high rates of suicide in happy places. J.Econ. Behav. Organ. 2011, 80:435-442.
23. De Maio F.G., Linetzky B., Ferrante D., Fleischer N.L. Extending the income inequality hypothesis: ecological results from the 2005 and 2009 Argentine National Risk Factor Surveys. Glob. Public Health 2012, 7:635-647.
24. De Vogli R., Mistry R., Gnesotto R., Cornia G.A. Has the relation between income inequality and life expectancy disappeared? Evidence from Italy and top industrialised countries. J.Epidemiol. Community Health 2005, 59:158-162.
25. de Vries R., Gosling S., Potter J. Income inequality and personality: are less equal U.S. states less agreeable?. Soc. Sci. Med. 2011, 72:1978-1985.
26. Deaton A., Lubotsky D. Mortality, inequality and race in American cities and states. Soc. Sci. Med. 2003, 56:1139-1153.
27. Delhey J., Dragolov G. Why inequality makes Europeans less happy: the role of distrust, status anxiety, and perceived conflict. Eur. Sociol. Rev. 2014, 30:151-165.
28. DeWall C.N., Deckman T., Pond R.S., Bonser I. Belongingness as a core personality trait: how social exclusion influences social functioning and personality expression. J.Pers. 2011, 79:1281-1314.
29. DeWall C.N., MacDonald G., Webster G.D., Masten C.L., Baumeister R.F., Powell C., et al. Acetaminophen reduces social pain behavioral and neural evidence. Psychol. Sci. 2010, 21:931-937.
30. Dickerson S.S., Kemeny M.E. Acute stressors and cortisol responses: a theoretical integration and synthesis of laboratory research. Psychol. Bull. 2004, 130:355-391.
31. Dorling D., Barford A. The inequality hypothesis: thesis, antithesis, and a synthesis?. Health Place 2009, 15:1166-1169. Discussion 1163-1165.
32. Drain P.K., Smith J.S., Hughes J.P., Halperin D.T., Holmes K.K. Correlates of national HIV seroprevalence: an ecologic analysis of 122 developing countries. J.Acquir. Immune Defic. Syndr. 2004, 35:407-420.
33. Eisenberger N.I., Jarcho J.M., Lieberman M.D., Naliboff B.D. An experimental study of shared sensitivity to physical pain and social rejection. Pain 2006, 126:132-138.
34. Eisenberger N.I., Lieberman M.D., Williams K.D. Does rejection hurt? An FMRI study of social exclusion. Science 2003, 302:290-292.
35. Elgar F.J. Income inequality, trust, and population health in 33 countries. Am. J. Public Health 2010, 100:2311-2315.
36. Elgar F.J., Aitken N. Income inequality, trust and homicide in 33 countries. Eur. J. Public Health 2011, 21:241-246.
37. Elliott L. Climate Change Will 'Lead to Battles for Food', Says Head of World Bank 2014, Guardian, London. http://www.theguardian.com/environment/2014/apr/03/climate-change-battle-food-head-world-bank?CMP=twt_gu.
38. Elstad J. Does the socioeconomic context explain both mortality and income inequality? Prospective register-based study of Norwegian regions. Int. J. Equity Health 2011, 10:1-11.
39. Fajnzylber P., Lederman D., Loayza N. Inequality and violent crime. J.Law Econ. 2002, 45:1-40.
40. Flegg A.T. Inequality of income, illiteracy and medical-care as determinants of infant-mortality in underdeveloped-countries. Popul. Studies A J. Demogr. 1982, 36:441-458.
41. Franzini L., Ribble J., Spears W. The effects of income inequality and income level on mortality vary by population size in Texas counties. J.Health Soc. Behav. 2001, 42:373-387.
42. Gilens M., Page B.I. Testing theories of American politics: Elites, interest groups, and average citizens. Perspect. Polit. 2014.
43. Gordis L. Epidemiology 2013, Elsevier Saunders, Philadelphia.
44. Hales S., Howden-Chapman P., Salmond C., Woodward A., Mackenbach J. National infant mortality rates in relation to gross national product and distribution of income. Lancet 1999, 354:2047.
45. Hamilton T.G., Kawachi I. Changes in income inequality and the health of immigrants. Soc. Sci. Med. 2013, 80:57-66.
46. Hill A.B. The environment and disease: association or causation?. Proc. R. Soc. Med. 1965, 58:295-300.
47. Holt-Lunstad J., Smith T.B., Layton J.B. Social relationships and mortality risk: a meta-analytic review. PLoS Med. 2010, 7:e1000316.
48. Hoynes H.W., Schanzenbach D.W., Almond D. Long Run Impacts of Childhood Access to the Safety Net 2012, National Bureau of Economic Research.
49. Hsieh C.-C., Pugh M.D. Poverty, income inequality, and violent crime: a meta-analysis of recent aggregate data studies. Crim. Justice Rev. 1993, 18:182-202.
50. Johnson R.C., Schoeni R.F. Early-life origins of adult disease: national longitudinal population-based study of the United States. Am. J. Public Health 2011, 101:2317-2324.
51. Johnson S.L., Leedom L.J., Muhtadie L. The dominance behavioral system and psychopathology: evidence from self-report, observational, and biological studies. Psychol. Bull. 2012, 138:692-743.
52. Johnson S.L., Wibbels E., Wilkinson R. Economic inequality is related to cross national prevalence of psychotic symptoms. Soc. Sci. Med. 2014, (forthcoming).
53. Kaplan G.A., Pamuk E.R., Lynch J.W., Cohen R.D., Balfour J.L. Inequality in income and mortality in the United States: analysis of mortality and potential pathways. BMJ 1996, 312:999-1003.
54. Kawachi I., Kennedy B.P., Lochner K., Prothrow-Stith D. Social capital, income inequality, and mortality. Am. J. Public Health 1997, 87:1491-1498.
55. Kennedy B.P., Kawachi I., Lochner K., Jones C., Prothrow-Stith D. (Dis)respect and black mortality. Ethn. Dis. 1997, 7:207-214.
56. Kennedy B.P., Kawachi I., Prothrow-Stith D. Income distribution and mortality: cross sectional ecological study of the Robin Hood index in the United States. BMJ 1996, 312:1004-1007.
57. Kenny C. Getting Better: Why Global Development Is Succeeding - and How We Can Improve the World Even More 2011, Basic Books, New York.
58. Kiecolt-Glaser J.K., Loving T.J., Stowell J.R., Malarkey W.B., Lemeshow S., Dickinson S.L., et al. Hostile marital interactions, proinflammatory cytokine production, and wound healing. Arch. Gen. Psychiatry 2005, 62:1377-1384.
59. Kondo N., Kawachi I., Subramanian S.V., Takeda Y., Yamagata Z. Do social comparisons explain the association between income inequality and health?: Relative deprivation and perceived health among male and female Japanese individuals. Soc. Sci. Med. 2008, 67:982-987.
60. Kondo N., Sembajwe G., Kawachi I., van Dam R.M., Subramanian S.V., Yamagata Z. Income inequality, mortality, and self rated health: meta-analysis of multilevel studies. BMJ 2009, 339:b4471.
61. Kondo N., van Dam R.M., Sembajwe G., Subramanian S.V., Kawachi I., Yamagata Z. Income inequality and health: the role of population size, inequality threshold, period effects and lag effects. J.Epidemiol. Community Health 2011.
62. Kondo N., van Dam R.M., Sembajwe G., Subramanian S.V., Kawachi I., Yamagata Z. Income inequality and health: the role of population size, inequality threshold, period effects and lag effects. J.Epidemiol. Community Health 2012, 66:e11.
63. Lagarde C. Speech at World Economic Forum, Davos 2013, (accessed 07.12.14.). https://www.imf.org/external/np/speeches/2013/012313.htm.
64. Larrea C., Kawachi I. Does economic inequality affect child malnutrition? The case of Ecuador. Soc. Sci. Med. 2005, 60:165-178.
65. Lancee B., Van de Werfhorst H.G. Income inequality and participation: A comparison of 24 European countries. Soc. Sci. Res. 2012, 41:1166-1178.
66. Layte R. The association between income inequality and mental health: testing status anxiety, social capital, and neo-materialist explanations. Eur. Sociol. Rev. 2012, 28:498-511.
67. Layte R., Whelan C. GINI DP 78: Who Feels Inferior? A Test of the Status Anxiety Hypothesis of Social Inequalities in Health 2013, AIAS, Amsterdam Institute for Advanced Labour Studies.
68. Loftin C., Hill R.H. Regional subculture and homicide: an examination of the Gastil-Hackney thesis. Am. Sociol. Rev. 1974, 39:714-724.
69. Loughnan S., Kuppens P., Allik J., Balazs K., de Lemus S., Dumont K., et al. Economic inequality is linked to biased self-perception. Psychol. Sci. 2011, 22:1254-1258.
70. Lynch J., Smith G.D., Harper S., Hillemeier M., Ross N., Kaplan G.A., et al. Is income inequality a determinant of population health? Part 1. A systematic review. Milbank Q. 2004, 82:5-99.
71. Lynch J.W., Smith G.D., Kaplan G.A., House J.S. Income inequality and mortality: importance to health of individual income, psychosocial environment, or material conditions. BMJ 2000, 320:1200-1204.
72. Macinko J.A., Shi L., Starfield B., Wulu J.T. Income inequality and health: a critical review of the literature. Med. Care Res. Rev. 2003, 60:407-452.
73. Marmot M. Inequalities in health: causes and policy implications. AState and Community Perspective 2000, vol. 2. New Press, New York. A. Tarlov, R. St. Peter (Eds.).
74. Marmot M. Status Syndrome: How Your Social Standing Directly Affects Your Health and Life Expectancy 2004, Bloomsbury, London.
75. Marmot M., Bobak M. International comparators and poverty and health in Europe. BMJ 2000, 321:1124-1128.
76. Messias E., Eaton W.W., Grooms A.N. Economic grand rounds: income inequality and depression prevalence across the United States: an ecological study. Psychiatr. Serv. 2011, 62:710-712.
77. Mitchell C., Hobcraft J., McLanahan S.S., Siegel S.R., Berg A., Brooks-Gunn J., et al. Social disadvantage, genetic sensitivity, and children's telomere length. Proc. Natl. Acad. Sci. 2014.
78. Moon B.-K. Remarks at Informal General Assembly Thematic Debate on Inequality 2013, United Nations. http://www.un.org/apps/news/infocus/sgspeeches/statments_full.asp?statID=1918#.UfDb943EPO4.
79. Nowatzki N.R. Wealth inequality and health: a political economy perspective. Int. J. Health Serv. 2012, 42:403-424.
80. Obama B. State of the Union Address 2014, (accessed 05.12.14.). http://www.whitehouse.gov/the-press-office/2014/01/28/president-barack-obamas-state-union-address.
81. OECD Doing Better for Children 2009, OECD Publishing, Paris.
82. OECD Divided We Stand: Why Inequality Keeps Rising 2011, OECD Publishing. http://dx.doi.org/10.1787/9789264119536-en.
83. Ortiz I., Cummins M. Global Inequality: Beyond the Bottom Billion - a Rapid Review of Income Distribution in 141 Countries 2011, Unicef Social and Economic Policy Working Paper, Unicef, New York, NY.
84. Paskov M., Dewilde C. Income inequality and solidarity in Europe. Res. Soc. Stratif. Mobil. 2012, 30:415-432.
85. Pei X., Rodriguez E. Provincial income inequality and self-reported health status in China during 1991-7. J.Epidemiol. Community Health 2006, 60:1065-1069.
86. Pickett K.E., James O.W., Wilkinson R.G. Income inequality and the prevalence of mental illness: a preliminary international analysis. J.Epidemiol. Community Health 2006, 60:646-647.
87. Pickett K.E., Kelly S., Brunner E., Lobstein T., Wilkinson R.G. Wider income gaps, wider waistbands? An ecological study of obesity and income inequality. J.Epidemiol. Community Health 2005, 59:670-674.
88. Pickett K.E., Mookherjee J., Wilkinson R.G. Adolescent birth rates, total homicides, and income inequality in rich countries. Am. J. Public Health 2005, 95:1181-1183.
89. Pickett K.E., Wilkinson R.G. Child wellbeing and income inequality in rich societies: ecological cross sectional study. BMJ 2007, 335:1080.
90. Pickett K.E., Wilkinson R.G. Child wellbeing and income inequality in rich societies: ecological cross sectional study. BMJ 2007, 335. 1080.
91. Pickett K.E., Wilkinson R.G. Greater equality and better health. BMJ 2009, 339:b4320.
92. Pickett K.E., Wilkinson R.G. Inequality: an underacknowledged source of mental illness and distress. Br. J. Psychiatry 2010, 197:426-428.
93. Piketty T., Saez E., Stantcheva S. Optimal Taxation of Top Labor Incomes: a Tale of Three Elasticities 2011, National Bureau of Economic Research.
94. Pope Francis Evangelii Gaudium 2013, Vatican Press, Vatican City.
95. Popper K. The Logic of Scientific Discovery 2002, Routledge, Abingdon.
96. Popper K. Conjectures and Refutations: the Growth of Scientific Knowledge 2014, Routledge, Abingdon.
97. Preston S.H. The changing relation between mortality and level of economic development. Popul. Stud. 2007, 29(2). July 1975. Reprinted in:. Int J Epidemiol, 36, 484-490.
98. Rajan K., Kennedy J., King L. Is wealthier always healthier in poor countries? The health implications of income, inequality, poverty, and literacy in India. Soc. Sci. Med. 2013, 88:98-107.
99. Ram R. Income inequality, poverty, and population health: evidence from recent data for the United States. Soc. Sci. Med. 2005, 61:2568-2576.
100. Ram R. Further examination of the cross-country association between income inequality and population health. Soc. Sci. Med. 2006, 62:779-791.
101. Rasella D., Aquino R., Barreto M.L. Impact of income inequality on life expectancy in a highly unequal developing country: the case of Brazil. J.Epidemiol. Community Health 2013, 67:661-666.
102. Rodgers G.B. Income and inequality as determinants of mortality: an international cross-section analysis. Popul. Stud. 1979, 33:343-351.
103. Rostila M., Kolegard M.L., Fritzell J. Income inequality and self-rated health in Stockholm, Sweden: a test of the 'income inequality hypothesis' on two levels of aggregation. Soc. Sci. Med. 2012, 74:1091-1098.
104. Rothman K.J., Greenland S., Lash T.L. Modern Epidemiology 2008, Lippincott Williams & Wilkins.
105. Rufrancos H., Power M., Pickett K.E., Wilkinson R. Income inequality and crime: a review and explanation of the time-series evidence. Sociol. Criminol. 2013, 1:103.
106. Russ T.C., Stamatakis E., Hamer M., Starr J.M., Kivimäki M., Batty G.D. Association between psychological distress and mortality: individual participant pooled analysis of 10 prospective cohort studies. BMJ 2012, 345.
107. Sapolsky R. Sick of poverty. Sci. Am. 2005, 293:92-99.
108. Schrecker T. Can health equity survive epidemiology? Standards of proof and social determinants of health. Prev. Med. 2013, 57:741-744.
109. Singh-Manoux A., Martikainen P., Ferrie J., Zins M., Marmot M., Goldberg M. What does self rated health measure? Results from the British Whitehall II and French Gazel cohort studies. J.Epidemiol. Community Health 2006, 60:364-372.
110. Smeeding T., Morelli S., Thompson J. Recent trends in income inequality in the developed countries. Progress. Econ. March 2014, 24-33.
111. Smith G.D., Hart C., Blane D., Gillis C., Hawthorne V. Lifetime socioeconomic position and mortality: prospective observational study. BMJ 1997, 314:547-552.
112. Subramanian S., Kawachi I. Response: in defence of the income inequality hypothesis. Int. J. Epidemiol. 2003, 32:1037-1040.
113. Subramanian S.V., Delgado I., Jadue L., Vega J., Kawachi I. Income inequality and health: multilevel analysis of Chilean communities. J.Epidemiol. Community Health 2003, 57:844-848.
114. Subramanian S.V., Kawachi I. The association between state income inequality and worse health is not confounded by race. Int. J. Epidemiol. 2003, 32:1022-1028.
115. Subramanian S.V., Kawachi I. Income inequality and health: what have we learned so far?. Epidemiol. Rev. 2004, 26:78-91.
116. Subramanian S.V., Kawachi I. Whose health is affected by income inequality? A multilevel interaction analysis of contemporaneous and lagged effects of state income inequality on individual self-rated health in the United States. Health Place 2006, 12:141-156.
117. Terry L.E.A. Smoking and Health: Report of the Advisory Committee to the Surgeon General of the United States 1964, U-23 Department of Health, Education, and Welfare, Washington, DC, Public Health Service Publication No. 1103.
118. The Equality Trust The Cost of Inequality 2014, The Equality Trust, London.
119. Torre R., Myrskyla M. Income inequality and population health: an analysis of panel data for 21 developed countries, 1975-2006. Popul. Stud. 2014, 68:1-13.
120. Tosi H.L., Werner S., Katz J.P., Gomez-Mejia L.R. How much does performance matter? A meta-analysis of CEO pay studies. J.Manag. 2000, 26:301-339.
121. United Nations Department of Economic and Social Affairs (UN DESA) Population Division World Population Prospects, the 2010 Revision 2011, United Nations, New York, NY.
122. Uslaner E.M., Brown M. Inequality, trust, and civic engagement. Am. Polit. Res. 2005, 33:868-894.
123. Wagstaff A., van Doorslaer E. Income inequality and health: what does the literature tell us?. Annu. Rev. Public Health 2000, 21:543-567.
124. Walberg P., McKee M., Shkolnikov V., Chenet L., Leon D.A. Economic change, crime, and mortality crisis in Russia: regional analysis. BMJ 1998, 317:312-318.
125. Wilkinson R., Pickett K. The Spirit Level: Why More Equal Societies Almost Always Do Better 2010, Penguin, London.
126. Wilkinson R.G. Income distribution and life expectancy. BMJ 1992, 304:165-168.
127. Wilkinson R.G. National mortality rates: the impact of inequality?. Am. J. Public Health 1992, 82:1082-1084.
128. Wilkinson R.G. Unhealthy Societies: the Afflictions of Inequality 1996, Routledge, London.
129. Wilkinson R.G., Kawachi I., Kennedy B. Mortality, the social environment, crime and violence. Soc. Health Illn. 1998, 20:578-597.
130. Wilkinson R.G., Pickett K. The Spirit Level: Why Equality Is Better for Everyone 2010, Penguin, London.
131. Wilkinson R.G., Pickett K.E. Income inequality and population health: a review and explanation of the evidence. Soc. Sci. Med. 2006, 62:1768-1784.
132. Wilkinson R.G., Pickett K.E. The problems of relative deprivation: why some societies do better than others. Soc. Sci. Med. 2007, 65:1965-1978.
133. Wilkinson R.G., Pickett K.E. Income inequality and socioeconomic gradients in mortality. Am. J. Public Health 2008, 98:699-704.
134. Wilkinson R.G., Pickett K.E. Income inequality and social dysfunction. Annu. Rev. Sociol. 2009, 35:493-512.
135. Wilson M., Daly M. Life expectancy, economic inequality, homicide, and reproductive timing in Chicago neighbourhoods. BMJ 1997, 314:1271-1274.
136. Wolfson M., Kaplan G., Lynch J., Ross N., Backlund E. Relation between income inequality and mortality: empirical demonstration. BMJ 1999, 319:953-955.
137. Wood A.M., Boyce C.J., Moore S.C., Brown G.D. An evolutionary based social rank explanation of why low income predicts mental distress: a 17 year cohort study of 30,000 people. J.Affect. Disord. 2012, 136:882-888.
138. World Bank World Development Indicators: Distribution of Income or Consumption. Washington, DC 2014, http://wdi.worldbank.org/table/2.9.
139. World Economic Forum Global Risks 2014, World Economic Forum, Geneva. http://www.weforum.org/reports/global-risks-2013-eighth-edition.
140. Zheng H. Do people die from income inequality of a decade ago?. Soc. Sci. Med. 2012, 75:36-45.