We show under lognormality that, when the Gini coefficient is stable over time, defining the poverty line as a fraction of a central tendency of the living standard distribution restricts the evolution of the poverty measures to be stable. That is, poverty does not change if the Gini coefficient does not change. Moreover, when the Gini coefficient slightly changes, most of the poverty change can be considered a change in inequality. Then, the consequences of using different poverty lines are analysed. Thus, important features in studies of poverty change based on these lines may result from methodological choices rather than from economic mechanisms.
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Paper provided by Instituto Valenciano de Investigaciones Económicas, S.A. (Ivie) in its series Working Papers. Serie AD with number
2005-13.
Find related papers by JEL classification: I32 - Health, Education, and Welfare - - Welfare and Poverty - - - Measurement and Analysis of Poverty O15 - Economic Development, Technological Change, and Growth - - Economic Development - - - Economic Development: Human Resources; Human Development; Income Distribution; Migration D31 - Microeconomics - - Distribution - - - Personal Income and Wealth Distribution
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