Behavioral economics is a field that combines psychology and economics. It acknowledges that humans are not rational decision makers and may need “nudges” to incentivize improvements in their health behaviors. Professor Omar Galárraga uses tools from behavioral economics to nudge those at highest risk of HIV infection toward healthier behaviors, like safer sex and the use of antiviral medication PrEP. Hear about his successful work in Mexico and his advocacy for national programs aimed at stopping the spread of HIV.