Education has been suggested as a "social vaccine" to prevent the spread of HIV (Jukes, Simmons, and Bundy, 2008), but almost all of the evidence we have on the link between school attendance (or attainment) and the risk of HIV infection comes from cross-sectional studies. Furthermore, the role of income (especially that of women's poverty) has been hypothesized as a significant factor in the spread of HIV in SSA, but again there is no credible evidence showing a causal link between income and HIV risk. A randomized intervention, such as the one proposed here, that provides randomly varied amounts of cash transfers to young individuals and their guardians is the perfect setting to examine the possible existence of such causal relationships.