Will paying people to avoid unsafe sex stop the spread of AIDS in Africa?

The World Bank thinks it’s worth a try: It will cofund a three-year experiment, whose start date has yet to be disclosed, wherein some 3,000 Tanzanian men and women 15 to 30 years old will be periodically tested for sexually transmitted diseases (STDs). Participants won’t be tested for HIV, however. Such tests are costly, and researchers can reasonably assume that if participants avoid contracting STDs during the...

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