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International Well-being Inequality
in the Long Run
Leandro Prados de la Escosura(Universidad Carlos III, Groningen, and CEPR)
GGDC 25th Anniversary ConferenceGroningen, 28-30 June 2017
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Main Questions
• Has inequality in well-being cumulated since
globalization began?
• Do inequality trends in well-being dimensions
concur?
• How much has the gap between the West and
the Rest contributed to international inequality?
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How to Measure Living Standards? (I)
• Original values for each dimension of welfare?
• But … if well-being indicators have asymptotic limits=> a transformation required to measure changes within
upper and lower bounds
Option: A linear transformation of the original values
Indices for each dimension (I) are computed as
I = (x - Mo) / (M - Mo), x, observed value of a given dimension of welfare, Mo and M, maximum and minimum values or goalposts
• But with original or linearly transformed values,
if a social variable has asymptotic limits,
identical absolute changes result in
different increases depending on the starting level
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Allowing for Quality in Health and Education
• Life expectancy at birth (LEB), crude measure of healthy life
- but health-adjusted life expectancy only available since mid-1990s
• Healthy life expectancy increases as LEB expands
- Age-specific disability is lower when LEB is higher:
as LEB increases, the quality of life rises for each age cohort
=> Longer LEB, better health in childhood and youth
• Literacy and Enrolment, crude proxies for access to knowledge
• The quality of education (cognitive skills) improves
as its quantity (literacy and enrolment rates) increases
=> More years of education, better education for children and youth
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Years of Poor Health and LEB in 2002
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How to Measure Living Standards? (II)
• Can time trends be inferred from cross-section patterns?
• A non-linear transformation of social variables (Kakwani)
as an indicator reaches higher levels,
its increases represent higher achievements than
if the increase occurred at a lower level
=> a convex achievement function
f (x, Mo, M) = ((M - Mo)1- – (M – x )1-) / ((M - Mo) 1-)
for 0 < <1 x, country values; M and Mo, maximum and minimum values
• If takes a value of 1,
f (x, Mo, M) = (log (M-Mo) – log (M–x)) / log (M-Mo)
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Preston Curve: The World 1870-2007
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Preston Curve Revised: The World 1870-2007
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Inequality Measures
- Gini
- MLD = G(0) = piln (p
i/y
i)
- Theil = G(1) = yiln (y
i/p
i)
with pi and yi representing country i shares in total population [Ni]and social indicators (Si) [Si*Ni]
- Atkinson (ε = 2)
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International Inequality in Real Per Capita GDP (unweighted)
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International Inequality in Real Per Capita GDP (population weighted)
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International Inequality in Real GDP per head: MLD
The Contribution of China & India and SSA
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Decomposing International Inequality
in Real Per Capita GDP: MLD (pop-weighted)
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International Inequality in Literacy (unweighted)
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International Inequality in Gross School Enrolment (unweighted)
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International Inequality in Gross School Enrolment (pop weighted)
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International Inequality in Enrolment MLD (pop weighted)
The Contribution of China & India and SSA
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Decomposing International Enrolment Inequality MLD (population weighted)
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International Inequality in Life Expectancy (unweighted)
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International Inequality in Life Expectancy (population weighted)
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International Inequality in Life Expectancy MLD (pop weighted)
The Contribution of China & India and SSA
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Decomposing International Life Expectancy Inequality
MLD (pop-weighted)
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Relative Life Expectancy in Developing Regions (OECD = 1)
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1870 1880 1890 1900 1913 1929 1938 1950 1960 1970 1980 1990 2000 2007
Central and Eastern Europe (incl Russia) Latin America China India Rest of Asia (excl Japan) North Africa SSA
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A Health Kuznets Curve? Gini (population-weighted)
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Main Findings
• Well-being inequality has declined over time
• Inequality trends in social dimensions concur
• Well-being dimensions alter the view on long run
inequality derived from real per capita GDP
- Inequality in social dimensions declined since 1920s
- while income inequality increased until mid-20th century
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World Inequality in HIHD* and GDP per Head MLD(population weighted) *excluding the income dimension
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Main Findings (2)
• China and India: major influence on inequality-2 trends,
different timing for income and social dimensions
• The West-Rest Gap, less relevant for international
inequality?
• The diffusion of the health transition(s) drives life
expectancy inequality
- A Health Kuznets Curve?
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Research Agenda
• Why inequality declined in well-being’s social dimensions
but not in GDP per head?
- Public policy?
- Medical technology, a public good?
• Why has not been a second health transition in the Rest? - Inequalising new technologies?
- Lack of public policies?
• Will the diffusion of the second health transition reduce
life expectancy inequality in the 21st century?
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A Multidimensional Approach to Wellbeing
• Human Development: enlarging people’s choices
• Achievements in longevity,
knowledge,
and living standard
provide individuals with freedom to choose
=> human development, a measure of positive freedom
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An Aggregate Well-being Measure:
Historical Index of Human Development
• Social dimensions, transformed with
a convex achievement function
• Yet … income diminishing returns
=> concave transformation (log GDP per head, a surrogate)
• All combined with a geometric average
HIHD = L1/3 E1/3 UNY1/3
to reduce its substitutability
=> only if all dimensions improve, HIHD improves
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International Inequality in Human Development (unweighted)
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International Inequality in Human Development(population weighted)
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International Inequality in Human Development MLD
The Contribution of China & India and SSA (population weighted)
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Decomposing Human Development Inequality MLD (pop-weighted)
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World Inequality in HIHD* and GDP per Head MLD(population weighted) *excluding the income dimension
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Main Findings
• Well-being inequality has declined over time
• Inequality trends in social dimensions concur
• Well-being dimensions alter the view on long run
inequality derived from real per capita GDP- Inequality in social dimensions declined after WWI
while income inequality increased
• China and India: major influence on inequality-2 trends
• The diffusion of the health transition(s) drives life
expectancy inequality
- A Health Kuznets Curve?
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Research Agenda
• Why inequality declined in social dimensions and HD,
but not in GDP per head?
- Public policy?
- Medical technology, a public good?
• Why has not been a second health transition in the Rest? - Inequalising new technologies?
- Lack of public policies?
- Health and education, high income elastic goods?
• Will the diffusion of the second health transition reduce
life expectancy (and HD) inequality?
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Cognitive Skills and Enrolment (normalized) 1960-90
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International Inequality in Literacy (pop weighted)
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International Inequality in Literacy: MLD (pop weighted)
The Contribution of China & India and SSA
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Decomposing International Literacy Inequality MLD (pop-weighted)
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Years of Poor Health and LEB in 2002
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Cognitive Skills and Enrolment (normalized) 1960-90
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Preston Curve: The World 1870-2007 Deaton’s Revision
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Decomposing International Inequality
in Real Per Capita GDP: Theil (pop-weighted)
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Decomposing International Life Expectancy Inequality
Theil (pop-weighted)
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Decomposing International Literacy Inequality Theil (pop-weighted)
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Decomposing International Enrolment Inequality Theil (population weighted)
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Decomposing Human Development Inequality Theil (pop-weighted)
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International Inequality in HIHD and GDP per Head
MLD (unweighted)
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International Inequality in HIHD and GDP per Head
MLD (population weighted)
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A Health Kuznets Curve? Theil (population-weighted)
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Global Income Inequality: Theil (van Zanden et al., 2013)
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World Inequality in HIHD* (unweighted)
* excluding the income dimension
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World Inequality in HIHD* (population unweighted)
* excluding the income dimension
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World Inequality in HIHD*: MLD (pop weighted)
*excluding the income dimension Contribution of China & India and SSA
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Decomposing World HIHD* Inequality: MLD * excluding the income dimension (pop-weighted)
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Decomposing World HIHD* Inequality: Theil * excluding the income dimension (pop-weighted)
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World Inequality in HIHD* and GDP per Head MLD(unweighted) *excluding the income dimension
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World Inequality in HIHD* and GDP per Head MLD(population weighted) *excluding the income dimension
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Life Expectancy in the World (1870-2007)non-linear [Kakwani] versus linear [UNDP‘hybrid’and‘old’] indices
0.000
0.100
0.200
0.300
0.400
0.500
0.600
0.700
0.800
1870 1880 1890 1900 1913 1929 1938 1950 1960 1970 1980 1990 2000 2007
Life_hyb_K Life_hyb_un Life_old_un
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Comparing Trends in HIHD and Per Capita GDP
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Drivers of World HIHD Growth (%)
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Drivers of Catching-up to OECD in the Rest (%)