After 6 months and thousands of hours looking through the literature on the most cost-effective and evidence-based global poverty interventions, our team determined that the winner is using text-message reminders to remind people of their upcoming vaccination appointments. This intervention has four randomized controlled trials (RCTs) finding a positive effect, two related Cochrane reviews, and estimates put it at a similar range of cost-effectiveness to some of the best charities in the world.
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