Emily Oster, a University of Chicago economist, looks at the stats on AIDS in Africa — and comes up with a stunning conclusion: Everything we know about AIDS in sub-Saharan Africa is wrong. We look for root causes such as poverty and poor health care — but we also need to factor in, say, the price of coffee, and the routes of long-haul truckers. In short, she says, there is a lot we don't know; and our assumptions about what we do know may keep us from finding the best way to stop the disease. (Recorded March 2007 in Monterey, CA. Duration: 15:45.)
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