Using lotteries to incentivize safer sexual behavior: evidence from a randomized controlled trial on HIV prevention
Martina Björkman Nyqvist,
Lucia Corno (),
Damien de Walque () and
No 7215, Policy Research Working Paper Series from The World Bank
Financial incentives are a promising HIV prevention strategy. This paper assesses the effect on HIV incidence of a lottery program in Lesotho with low expected payments but a chance to win a high prize conditional on negative test results for sexually transmitted infections. The intervention resulted in a 21.4 percent reduction in HIV incidence over two years. Lottery incentives appear to be particularly effective for individuals willing to take risks. This paper estimates a model linking sexual behavior to HIV incidence and finds that risk-loving individuals reduce the number of unprotected sexual acts by 0.3/month for every $1 increase in the expected prize.
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