NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

The Illusion of Sustainability

Michael Kremer, Edward Miguel

NBER Working Paper No. 10324
Issued in February 2004
NBER Program(s):   EFG   HC   PE

The history of foreign development assistance is one of movement away from addressing immediate needs and toward focusing on the underlying causes of poverty. A recent manifestation is the move towards sustainability,' which stresses community mobilization, education, and cost-recovery. This stands in contrast to the traditional economic analysis of development projects, with its focus on providing public goods and correcting externalities. We examine evidence from randomized evaluations on strategies for combating intestinal worms, which affect one in four people worldwide. Providing medicine to treat worms was extremely cost effective, although medicine must be provided twice per year indefinitely to keep children worm-free. An effort to promote sustainability by educating Kenyan schoolchildren on worm prevention was ineffective, and a mobilization' intervention from psychology failed to boost deworming drug take-up. Take-up was highly sensitive to drug cost: a small increase in cost led to an 80 percent reduction in take-up (relative to free treatment). The results suggest that, in the context we examine, the pursuit of sustainability may be an illusion, and that in the short-run, at least, external subsidies will remain necessary.

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This paper was revised on August 3, 2006

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Document Object Identifier (DOI): 10.3386/w10324

Published: Kremer, Michael and Edward Miguel. “The Illusion of Sustainability.” Quarterly Journal of Economics 122, 3 (2007): 1007-1065. [re-printed in Reinventing Foreign Aid, (ed.) William Easterly, MIT Press] citation courtesy of

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