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Price Adjustments and Poverty Measurement

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  • Amendola,Nicola
  • Mancini,Giulia
  • Redaelli,Silvia
  • Vecchi,Giovanni

Abstract

Measuring poverty entails making interpersonal welfare comparisons, that should account fordifferences in prices faced by households, both over time and across space. This paper investigates the impact ofseemingly minor differences in the practical implementation of price adjustments, by developing an analytical frameworkthat is consistent with standard consumer theory and mindful of the data limitations faced by practitioners. The mainresult is at odds with common sense: even when multiple price indexes are available, say a food and a nonfoodConsumer Price Index, it turns out that using a single price index, the total Consumer Price Index, to adjust theconsumption aggregate is recommended. The practice of adjusting the components of the consumption aggregateseparately, using matching deflators—food expenditure with the food index and nonfood expenditure with the nonfoodindex—can lead to a systematic bias in the welfare measure, and consequently in poverty and inequality measures. Thedirection of the bias can be easily predicted based on the price level and household consumption patterns. On theinterplay between spatial and temporal deflation, the findings show that temporal deflation should be carried outbefore implementing adjustments to spatial cost-of-living differences. The paper illustrates these findings using theIslamic Republic of Iran’s 2019 Household Income and Expenditure survey: the bias in the headcount poverty ratedue to incorrect deflation is substantive (5–10 percent for estimates at the national level, 15–20 percent in urban andrural areas, and more than 30 percent for district-level headcount rates). Higher-order Foster-Greer-Thorbecke poverty measures are even more affected.

Suggested Citation

  • Amendola,Nicola & Mancini,Giulia & Redaelli,Silvia & Vecchi,Giovanni, 2023. "Price Adjustments and Poverty Measurement," Policy Research Working Paper Series 10426, The World Bank.
  • Handle: RePEc:wbk:wbrwps:10426
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    References listed on IDEAS

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    1. Gibson, John & Kim, Bonggeun, 2013. "Quality, Quantity, and Nutritional Impacts of Rice Price Changes in Vietnam," World Development, Elsevier, vol. 43(C), pages 329-340.
    2. McKelvey, Christopher, 2011. "Price, unit value, and quality demanded," Journal of Development Economics, Elsevier, vol. 95(2), pages 157-169, July.
    3. John Gibson & Scott Rozelle, 2005. "Prices and Unit Values in Poverty Measurement and Tax Reform Analysis," The World Bank Economic Review, World Bank, vol. 19(1), pages 69-97.
    4. Angus Deaton & Salman Zaidi, 1999. "Guidelines for Constructing Consumption Aggregates For Welfare Analysis," Working Papers 217, Princeton University, Woodrow Wilson School of Public and International Affairs, Research Program in Development Studies..
    5. Ravallion, Martin, 2016. "The Economics of Poverty: History, Measurement, and Policy," OUP Catalogue, Oxford University Press, number 9780190212773, Decembrie.
    6. Ravallion, Martin & Chen, Shaohua, 2003. "Measuring pro-poor growth," Economics Letters, Elsevier, vol. 78(1), pages 93-99, January.
    7. Angus Deaton & Salman Zaidi, 2002. "Guidelines for Constructing Consumption Aggregates for Welfare Analysis," World Bank Publications, The World Bank, number 14101, April.
    8. Gibson, John & Kim, Bonggeun, 2019. "Quality, quantity, and spatial variation of price: Back to the bog," Journal of Development Economics, Elsevier, vol. 137(C), pages 66-77.
    9. Shorrocks, A F, 1978. "The Measurement of Mobility," Econometrica, Econometric Society, vol. 46(5), pages 1013-1024, September.
    10. Lionel McKenzie, 1957. "Demand Theory Without a Utility Index," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 24(3), pages 185-189.
    11. Blackorby, Charles & Donaldson, David, 1988. "Money metric utility: A harmless normalization?," Journal of Economic Theory, Elsevier, vol. 46(1), pages 120-129, October.
    12. Blackorby, Charles & Donaldson, David, 1987. "Welfare ratios and distributionally sensitive cost-benefit analysis," Journal of Public Economics, Elsevier, vol. 34(3), pages 265-290, December.
    13. Deaton, A. & Zaidi, S., 1999. "Guidelines for Constructing Consumption Aggregates for Welfare Analysis," Papers 192, Princeton, Woodrow Wilson School - Development Studies.
    14. Gibson, John & Kim, Bonggeun, 2015. "Hicksian separability does not hold over space: Implications for the design of household surveys and price questionnaires," Journal of Development Economics, Elsevier, vol. 114(C), pages 34-40.
    15. Dean Jolliffe, 2006. "Poverty, Prices, and Place: How Sensitive is the Spatial Distribution of Poverty to Cost of Living Adjustments?," Economic Inquiry, Western Economic Association International, vol. 44(2), pages 296-310, April.
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