BOOK REVIEW: The Idealist: Jeffrey Sachs and the Quest to End Poverty, by Nina Munk.

Sachs’ technical fixes frequently turned out to be anything but simple. The saga of Dertu’s wells is illustrative. Ahmed Mohamed, the local man in charge of the effort, discovers that he needs to order a crucial part for a generator that powers the wells. The piece takes four months to arrive, and then nobody knows how to install it. Eventually a distant mechanic arrives at great expense. A couple of years later, Munk returns to find Mohamed struggling with the same issues: The wells have broken down again, the parts are lacking, and nobody knows how to fix the problem.

A little more than a year after that, the wells are up and running again, and the Millennium Villages blog celebrates Dertu as having “the most reliable water supply within the region.” Yet by 2011 the wells have run completely dry due to a drought—a not-uncommon occurrence in the arid region.

Such examples multiply in Munk’s book, showing that purely technological answers to poverty fall well short of Sachs’ promises. It turns out that technology does not implement itself; it requires the assistance of real people subject to widely varying incentives and constraints in complex social and political systems.