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The only type of resource that is correlated with student performance is teacher salaries ...

„Analysis of PISA results suggests that the only type of resource that is correlated with student performance is teacher salaries relative to national income. There is a statistically significant positive relationship between teacher salaries relative to GDP per capita and PISA 2012 math scores in economies with GDP per capita of more than US$20,000.“

World Bank Group (Hrsg.), „Growing Smarter“ (2018), S. 113