This article evaluates the relationship between inequality in cognitive test scores across countries and income inequality. By meta-analyzing the standard deviations in PISA results from 2000 to 2018, the authors construct a measure of intelligence inequalities across countries. They then test this measure to investigate if it has any association with income inequality as measured by the gini index. Across all models and subsamples, the authors do not find a positive association between intelligence inequality and income inequality. In models where the coefficient is statistically significant, the direction is unexpectedly negative, implying greater intelligence inequality is associated with lower income inequality. This is contrary to theoretical predictions of a positive association between these variables. Finally, the authors also find some evidence that greater mean intelligence is associated with lower levels of income inequality.

中文翻译：

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智力不平等和收入不平等

本文评估了各国认知测试分数不平等与收入不平等之间的关系。通过荟萃分析中的标准偏差比萨从 2000 年到 2018 年的结果，作者构建了一个衡量各国智力不平等的指标。然后，他们测试了这一衡量标准，以调查它是否与基尼指数衡量的收入不平等有任何关联。在所有模型和子样本中，作者没有发现智力不平等与收入不平等之间存在正相关关系。在系数具有统计显着性的模型中，方向出乎意料地为负，这意味着更大的智力不平等与降低收入差距。这与这些变量之间正相关的理论预测相反。最后，作者还发现了一些证据，表明更高的平均智力与更低的收入不平等程度相关。