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How robust is a poverty profile?

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  • Ravallion, Martin
  • Bidani, Benu

Abstract

Comparisons of poverty - indicating where or when poverty is greatest, for example - typically matter far more to policy choices than aggregate poverty measures, such as how many people are deemed"poor."So the author's examine how measurement practices affect empirical poverty profiles. They discuss the pros and cons of alternative approaches to developing a poverty profile and use those approaches on the same data set. In Indonesia, as in many countries, past methods of building poverty profiles have used the food-energy-intake method, defining the poverty line as the normal consumption spending at which a person typically attains a predetermined food-energy-intake in each subgroup. The author's argue that his method can yield differences in poverty lines (between urban and rural areas, for example) that exceed the cost-of-living differences the poor face. So, that method can mislead policy choices aimed at reducing absolute poverty. For comparison, they explore a cost-of-basic-needs methods, whereby an explicit bundle of foods typically consumed by the poor is valued at local prices, with a minimal allowance for non-food goods consistent with spending by the poor. This approach, though not ideal, is a conceptually transparent operational alternative that can be implemented with available data. They argue that this approach is more likely to generate a consistent poverty profile in that two people with the same measured standard of living - purchasing power of basic consumption needs - will be treated the same way. This refinement of past approaches retains some seemingly desirable features (such as concern for the tastes of the poor) and avoids others (such as the implicit use of a higher real poverty line in richer regions of the same country). For Indonesia, the cost-of-basic-needs methods finds more incidence, depth, and severity of poverty in rural areas, whereas the food-energy-intake method finds all measures of poverty worse in urban areas. The ranking of regions (provinces divided into rural and urban) by two methods has virtually zero correlation. The poverty profile by principal sector of employment is less sensitive to the choice of method, particularly in urban areas. This case study supports the conclusion that policymakers should be wary of underlying differences between methods of estimating poverty measures. The cost-of-basic-needs approach is fairly robust to severaly other methodological choices, notably changes in the composition of the basic need bundle (which determines the overall level of the poverty line), differences in the functional form of the poverty measure, and adjustment for spatial differences in prices, issues that have dominated debates on how to measure poverty. Ironically, the results of this study suggest that these issues matter less to poverty rankings (and hence to policy conclusions) than do the choices made in mapping a given specification of basic needs into monetary poverty lines.

Suggested Citation

  • Ravallion, Martin & Bidani, Benu, 1993. "How robust is a poverty profile?," Policy Research Working Paper Series 1223, The World Bank.
  • Handle: RePEc:wbk:wbrwps:1223
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    References listed on IDEAS

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    1. Foster, James & Greer, Joel & Thorbecke, Erik, 1984. "A Class of Decomposable Poverty Measures," Econometrica, Econometric Society, vol. 52(3), pages 761-766, May.
    2. Ravallion, Martin & van de Walle, Dominique, 1991. "Urban-rural cost-of-living differentials in a developing economy," Journal of Urban Economics, Elsevier, vol. 29(1), pages 113-127, January.
    3. Arie Kapteyn & Peter Kooreman & Rob Willemse, 1988. "Some Methodological Issues in the Implementation of Subjective Poverty Definitions," Journal of Human Resources, University of Wisconsin Press, vol. 23(2), pages 222-242.
    4. Deaton,Angus & Muellbauer,John, 1980. "Economics and Consumer Behavior," Cambridge Books, Cambridge University Press, number 9780521296762.
    5. Ravallion, Martin, 1992. "Does Undernutrition Respond to Incomes and Prices? Dominance Tests for Indonesia," World Bank Economic Review, World Bank Group, vol. 6(1), pages 109-124, January.
    6. Martin Ravallion & Gaurav Datt & Dominique van de Walle, 1991. "Quantifying Absolute Poverty In The Developing World," Review of Income and Wealth, International Association for Research in Income and Wealth, vol. 37(4), pages 345-361, December.
    7. Ravallion, Martin & Datt, Gaurav & van de Walle, Dominique, 1991. "Quantifying Absolute Poverty in the Developing World," Review of Income and Wealth, International Association for Research in Income and Wealth, vol. 37(4), pages 345-361, December.
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