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How dirty are"quick and dirty"methods of project appraisal?

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  • van de Walle, Dominique
  • Gunewardena, Dileni

Abstract

Routine"quick-and-dirty"methods of project appraisal can be so dirty in guiding project selection as to wipe out the net social gains from public investment, contend the authors, illustrating their point with a case study of irrigation projects in Vietnam. They test a common quick-and-dirty method for estimating benefits from irrigation investments, using data for Vietnam. They compare the results with impacts assessed through econometric modeling of marginal returns, which allows for household and area heterogeneity using integrated household-level survey data. The quick-and-dirty method performs well in estimating average benefits nationally but can be misleading for some regions and, by ignoring heterogeneity, overestimates how much the poor gain. At moderate to high project cost levels, quick-and-dirty makes enough mistakes to eliminate the net benefits from public investment. When irrigating as little as 3 percent of Vietnam's nonirrigated land, the savings from the more data-intensive method are enough to cover the costs of the extra data required.

Suggested Citation

  • van de Walle, Dominique & Gunewardena, Dileni, 1998. "How dirty are"quick and dirty"methods of project appraisal?," Policy Research Working Paper Series 1908, The World Bank.
    • Handle: RePEc:wbk:wbrwps:1908
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    References listed on IDEAS

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    3. Londero, Elio, 1987. "Benefits and Beneficiaries: An Introduction to Estimating Distributional Effects in Cost-Benefit Analysis (Second Edition)," MPRA Paper 60345, University Library of Munich, Germany, revised 1996.
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    1. van de Walle, Dominique, 1998. "Assessing the welfare impacts of public spending," World Development, Elsevier, vol. 26(3), pages 365-379, March.

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