Sala-i_Martin_Income_Inequality

Sala-i_Martin_Income_Inequality - NBER WORKING PAPER SERIES...

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NBER WORKING PAPER SERIES THE DISTURBING “RISE” OF GLOBAL INCOME INEQUALITY Xavier Sala-i-Martin Working Paper 8904 http://www.nber.org/papers/w8904 NATIONAL BUREAU OF ECONOMIC RESEARCH 1050 Massachusetts Avenue Cambridge, MA 02138 April 2002 This paper was partly written when I was visiting Universitat Pompeu Fabra in Barcelona. I thank Sanket Mohapatra for extraordinary research assistance and for comments, suggestions and short speeches related to this paper. I also benefitted from the comments of Elsa V. Artadi, Tony Atkinson, François Bourguignon, Gernot Doppelhofer, Laila Haider, and Casey B. Mulligan. The views expressed herein are those of the author and not necessarily those of the National Bureau of Economic Research. © 2002 by Xavier Sala-i-Martin. All rights reserved. Short sections of text, not to exceed two paragraphs, may be quoted without explicit permission provided that full credit, including © notice, is given to the source.
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The Disturbing “Rise” of Global Income Inequality Xavier Sala-i-Martin NBER Working Paper No. 8904 April 2002 JEL No. D31, F0, I30, I32, O00 ABSTRACT We use aggregate GDP data and within-country income shares for the period 1970-1998 to assign a level of income to each person in the world. We then estimate the gaussian kernel density function for the worldwide distribution of income. We compute world poverty rates by integrating the density function below the poverty lines. The $1/day poverty rate has fallen from 20% to 5% over the last twenty five years. The $2/day rate has fallen from 44% to 18%. There are between 300 and 500 million less poor people in 1998 than there were in the 70s. We estimate global income inequality using seven different popular indexes: the Gini coefficient, the variance of log-income, two of Atkinson’s indexes, the Mean Logarithmic Deviation, the Theil index and the coefficient of variation. All indexes show a reduction in global income inequality between 1980 and 1998. We also find that most global disparities can be accounted for by across-country, not within- country, inequalities. Within-country disparities have increased slightly during the sample period, but not nearly enough to offset the substantial reduction in across-country disparities. The across-country reductions in inequality are driven mainly, but not fully, by the large growth rate of the incomes of the 1.2 billion Chinese citizens. Unless Africa starts growing in the near future, we project that income inequalities will start rising again. If Africa does not start growing, then China, India, the OECD and the rest of middle-income and rich countries diverge away from it, and global inequality will rise. Thus, the aggregate GDP growth of the African continent should be the priority of anyone concerned with increasing global income inequality. Xavier Sala-i-Martin Department of Economics Columbia University 420 West 118th St., 1005 New York, NY 10027 and NBER xs23@columbia.edu
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1. Introduction .
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Sala-i_Martin_Income_Inequality - NBER WORKING PAPER SERIES...

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