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It is almost universally agreed that more education is good for society.Likewise, extending the school day seems an easy way to ensure that pupils learn more; but research finds that time spent in school matters considerably less than what happens there.This finding is supported by a recent OECD study, which revealed that over the last decade there has been no "appreciable improvement" in student achievement in the rich countries that invest most in technology for education.In assessing research relevant for policymakers in Bangladesh, Rabbani found only one study showing that additional textbooks definitely improved test scores – and only the top students benefited.In Bangladesh, 6 million children are stunted – four in 10 children below the age of 5 years old, compared to the global average of around 25 percent.Setting up early childhood education centers in Bangladesh could transform lives, at a cost of around $300 per student. Based on the Jamaican study, income improvements would be worth around $10,000 over each child's lifetime. For Bangladesh, it is estimated that spending $100 dividing students (and potentially employing some extra teachers) would increase scores by nearly two standard deviations.
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