What’s more, deworming didn’t merely have educational benefits. It had health and economic benefits, too. Intestinal worms can cause a variety of maladies, including anaemia, intestinal obstruction and a suppressed immune system that can increase the likelihood of contracting other diseases like malaria. Deworming decreases all these risks. Moreover, when Kremer’s colleagues followed up with the children ten years later, those who had been dewormed were working on average an extra 3.4 hours per week and earning an extra 20% of income compared to those who had not been dewormed. In fact,
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