Book•
On Economic Inequality
01 Jan 1973-
TL;DR: In this paper, Amartya Sen relates the theory of welfare economics to the study of economic inequality and presents a systematic treatment of the conceptual framework as well as the practical problems of measurement of inequality.
Abstract: In this classic text, first published in 1973, Amartya Sen relates the theory of welfare economics to the study of economic inequality. He presents a systematic treatment of the conceptual framework as well as the practical problems of measurement of inequality. In his masterful analysis, Sen assesses various approaches to measuring inequality and delineates the causes and effects of economic disparities. Containing the four lectures from the original edition as well as a new introduction, this timeless study is essential reading for economists, philosophers, and social scientists. In a new introduction, Amartya Sen, jointly with James Foster, critically surveys the literature that followed the publication of this book, and also evaluates the main analytical issues in the appraisal of economic inequality and poverty.
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TL;DR: Collier and Hoeffler as discussed by the authors compare two contrasting motivations for rebellion: greed and grievance, and show that many rebellions are linked to the capture of resources (such as diamonds in Angola and Sierra Leone, drugs in Colombia, and timber in Cambodia).
Abstract: Of the 27 major armed conflicts that occurred in 1999, all but two took place within national boundaries. As an impediment to development, internal rebellion especially hurts the world's poorest countries. What motivates civil wars? Greed or grievance? Collier and Hoeffler compare two contrasting motivations for rebellion: greed and grievance. Most rebellions are ostensibly in pursuit of a cause, supported by a narrative of grievance. But since grievance assuagement through rebellion is a public good that a government will not supply, economists predict such rebellions would be rare. Empirically, many rebellions appear to be linked to the capture of resources (such as diamonds in Angola and Sierra Leone, drugs in Colombia, and timber in Cambodia). Collier and Hoeffler set up a simple rational choice model of greed-rebellion and contrast its predictions with those of a simple grievance model. Some countries return to conflict repeatedly. Are they conflict-prone or is there a feedback effect whereby conflict generates grievance, which in turn generates further conflict? The authors show why such a feedback effect might be present in both greed-motivated and grievance rebellions. The authors' results contrast with conventional beliefs about the causes of conflict. A stylized version of conventional beliefs would be that grievance begets conflict, which begets grievance, which begets further conflict. With such a model, the only point at which to intervene is to reduce the level of objective grievance. Collier and Hoeffler's model suggests that what actually happens is that opportunities for predation (controlling primary commodity exports) cause conflict and the grievances this generates induce dias-poras to finance further conflict. The point of policy intervention here is to reduce the absolute and relative attraction of primary commodity predation and to reduce the ability of diasporas to fund rebel movements. This paper - a product of the Development Research Group - is part of a larger effort in the group to study civil war and criminal violence. For more on this effort, go to www.worldbank.org/research/conflict. Paul Collier may be contacted at pcollier@worldbank.org.
5,349 citations
TL;DR: The authors investigated the causes of civil war, using a new data set of wars during 1960-99 and found that economic viability appears to be the predominant systematic explanation of rebellion, while atypically severe grievances such as high inequality, a lack of political rights, or ethnic and religious divisions in society.
Abstract: This study investigates the causes of civil war, using a new data set of wars during 1960-99. Rebellion may be explained by atypically severe grievances, such as high inequality, a lack of political rights, or ethnic and religious divisions in society. Alternatively, it might be explained by atypical opportunities for building a rebel organization. Opportunity may be determined by access to finance, such as the scope for extortion of natural resources, and for donations from a Diaspora population. Opportunity may also depend upon factors such as geography: mountains and forests may be needed to incubate rebellion. These explanations are tested and find that opportunity provides considerably more explanatory power than grievance. Economic viability appears to be the predominant systematic explanation of rebellion. The results are robust to correction for outliers, alternative variable definition, and variations in estimation method
3,808 citations
Posted Content•
TL;DR: This paper proposed a new methodology for multidimensional poverty measurement consisting of an identification method ρk that extends the traditional intersection and union approaches, and a class of poverty measures Mα.
Abstract: This paper proposes a new methodology for multidimensional poverty measurement consisting of an identification method ρk that extends the traditional intersection and union approaches, and a class of poverty measures Mα. Our identification step employs two forms of cutoff: one within each dimension to determine whether a person is deprived in that dimension, and a second across dimensions that identifies the poor by ‘counting’ the dimensions in which a person is deprived. The aggregation step employs the FGT measures, appropriately adjusted to account for multidimensionality. The axioms are presented as joint restrictions on identification and the measures, and the methodology satisfies a range of desirable properties including decomposability. The identification method is particularly well suited for use with ordinal data, as is the first of our measures, the adjusted headcount ratio. We present some dominance results and an interpretation of the adjusted headcount ratio as a measure of unfreedom. Examples from the US and Indonesia illustrate our methodology.
2,040 citations
TL;DR: The authors proposed a new methodology for multidimensional poverty measurement consisting of an identification method ρk that extends the traditional intersection and union approaches, and a class of poverty measures Mα.
1,677 citations
Posted Content•
TL;DR: In this paper, the authors studied the U.S. earning trends since 1950 and gave explanations for the inequality in earnings and found that both slow growth and increased inequality appeared in the comparison of adult male earnings distributions for 1979 and 1987.
Abstract: The article studies the U.S. earning trends since 1950 and gives explanations for the inequality in earnings. Both slow growth and increased inequality appear in the comparison of adult male earnings distributions for 1979 and 1987. Trends in women's earnings paint a somewhat brighter picture. Women, like men, have experienced slow hourly wage growth and growing wage inequality. But in terms of annual earnings, both factors have been offset by changes in hours worked. The result is a significant increase in the proportion of women who earn $20,000 a year or more. A combination of shifts in supply and shifts in demand is necessary to explain the observed trends between these groups. A critical aspect of supply shifts was the entry into the labor market of the well-educated baby boom generation. Demand shifts can be characterized as a long-term trend toward increasing relative demand for highly skilled workers. The growth in within group earnings inequality has many potential explanations, but it is not well understood and contains opportunities for future research.
1,616 citations