Understanding behavioral responses to changes in actual or perceived risk is important because risk-reduction goals can be undermined by risk-compensating behavior. This paper examines the response to new information about the risk of HIV infection. Approximately 1,200 circumcised and uncircumcised men in rural Malawi are randomly informed that male circumcision reduces the HIV transmission rate, predicting asymmetric behavioral responses. We find no evidence that the information induces circumcised men to engage in riskier sex while uncircumcised men practice safer sex in response to the information. There were no significant effects of the information on child circumcisions after one year.

We study a randomized evaluation of a merit scholarship program in which Kenyan girls who scored well on academic exams had school fees paid and received a grant. Girls showed substantial exam score gains, and teacher attendance improved in program schools. There were positive externalities for girls with low pretest scores, who were unlikely to win a scholarship. We see no evidence for weakened intrinsic motivation. There were heterogeneous program effects. In one of the two districts, there were large exam gains and positive spillovers to boys. In the other, attrition complicates estimation, but we cannot reject the hypothesis of no program effect.