But the researchers were surprised to find that, among kids who benefited from an extra year of school, those who grew up with more than 10 non-school books (that is, books they weren’t forced to read) at home eventually doubled that lifetime earning advantage, to 21%. Factors like whether the boys’ fathers had white-collar jobs, and whether their homes had running water, did not seem to make a difference. [...]
The researchers based their models on data collected from men between ages 60 and 96 from Austria, Belgium, the Czech Republic, Denmark, France, Germany, Italy, the Netherlands, and Sweden, part of a massive ongoing survey of Europeans. They compared whether the men grew up in rural or urban environments, the years they were in school, roughly how many books they had in their houses at age 10, and their income across their lives. The study was published online in April in The Economic Journal.
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