Richard Freeman, Stephen Machin, Martina Viarengo, 04 January 2011

Many interpret countries' scores in international testing as grades of their national educational policies. Summarising evidence from international maths exams, this column finds that the highest-scoring countries are those with the least inequality in test scores, suggesting a “virtuous” equity-efficiency trade-off. It also finds that countries perform even better when test scores are highly correlated with the number of books in the family home.

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