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Martin Ravallion

In defense of single project evaluations: A response to Ravallion

David McKenzie's picture

Yesterday Martin Ravallion argued that the fact that much of the impact evaluation taking place involves assessing the impact of specific projects one at a time is not that helpful in assessing development impact because it doesn’t tell us about the impact of overall portfolios if there are interactions between policies or if the subset of projects which get evaluated in an overall portfolio are not a representative sample.

Guest Post by Martin Ravallion: Are we really assessing development impact?

When people ask about “development impact” they are often referring to the impact of some set of development policies and projects; let’s call it a “development portfolio.” The portfolio of interest may be various things that are (ostensibly) financed by the domestic resources of developing countries. Or it might be a set of externally-financed projects spanning multiple countries—a portfolio held by a donor country or international organization, such as the World Bank.