Village-level lotteries in Lesotho, a small country in southern Africa, conducted every four months for two years to incentivize prevention of HIV and other sexually-transmitted infections (STIs). Village residents could participate in a lottery if they tested negative for two curable STIs – syphilis and trichonomiasis – prior to the lottery. The lotteries offered potential cash prizes of either $50 or $100. The lottery payout averaged $29 per program participant over two years, making this a very inexpensive program.
Arnold Ventures’ Evidence-Based Policy team continuously monitors and reviews the evaluation literature in international development, as we do in domestic U.S. social policy, to identify programs with credible RCT evidence of important effects on people’s lives. However, given our organization’s focus on U.S. social policy, we only provide “highlights” of our evidence reviews for most international development programs (as shown above), without the accompanying detailed PDF summaries that we provide for U.S. programs.