Substitution Bias and External Validity: Why an Innovative Anti-poverty Program Showed no Net Impact
AbstractThe net impact of development interventions can depend on the availability of close substitutes to the intervention. We analyze a randomized trial of an innovative anti-poverty program in South India which provides “ultra-poor” households with inputs to create a new, sustainable livelihood. We find no statistically significant evidence of lasting net impact on consumption, income or asset accumulation. Instead, income from the new livelihood substituted for earnings from wage labor. A very similar intervention made a large difference elsewhere in South Asia, however, where wage labor alternatives were less compelling. The analysis highlights the roles of substitution bias and dropout bias in shaping evaluation results and delimiting external validity.
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Bibliographic InfoPaper provided by Center for Economic Institutions, Institute of Economic Research, Hitotsubashi University in its series CEI Working Paper Series with number 2013-03.
Length: 57, 14 p.
Date of creation: Jul 2013
Date of revision:
Find related papers by JEL classification:
- O1 - Economic Development, Technological Change, and Growth - - Economic Development
- J2 - Labor and Demographic Economics - - Demand and Supply of Labor
- C1 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General
- I3 - Health, Education, and Welfare - - Welfare, Well-Being, and Poverty
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