„One of the home possessions that most clearly distinguishes students of different socio-economic status is the number of books at home. While 46 % of advantaged students reported having more than 200 books at home, on average, this is the case for only 6 % of their disadvantaged peers.“
OECD (Hrsg.), „PISA 2018 Results. Where All Students Can Succeed“ (2019), S. 55