„When evaluating how far different national school systems reproduce inequality, it is important to know whether they are starting from a common baseline or whether local conditions make the provision of equal opportunities within the educational system a more challenging task in some countries than others. […] Large SES disparities predate school entry and differ significantly in magnitude across countries.“
Jascha Dräger u.a., Cross-national Differences in Socioeconomic Achievement Inequality in Early Primary School (2024), S. 2.