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IMF managing director Christine Lagarde startled IFI watchers last week by warning at a CGD-hosted speech that the world faces “a triple crisis—an economic crisis, an environmental crisis and, increasing, a social crisis.”

Lagarde’s remarks, which I report on at greater length here, would not have been newsworthy coming from the head of an international environmental NGO or even the head of the World Bank, but from the head of the IMF, a citadel of economic orthodoxy, they surprised and delighted many in the development community, especially those alarmed by the looming development impacts of runaway climate change.

Microfinance has been whiplashed by the hype cycle. Where it once was seen as a powerful treatment for poverty, recent headlines have favored phrases such as “borrower revolt,” “doesn’t work after all,” and “suicide.” What to make of this cacophony? David Roodman seeks the sensible truth in his new book, Due Diligence: An Impertinent Inquiry into Microfinance, with an investigation that is unprecedented in its depth and breadth. He concludes that, while financial services are no more likely to lift people out of poverty than clean water and electricity, the microfinance movement has built thriving industries that deliver valuable services to millions of poor people. The challenge going forward is to help microfinance play to its strengths. In general, that calls for putting less money into microcredit, to avoid credit bubbles and increase the incentive for microfinance institutions to take savings deposits.