I can confirm that it's also a cultural issue. In northern countries, the aim of young adults is to move out of their parents' home, and there is even a social stigma if they don't. In the south, young people like the comfort of their parents' home. The issue of income is important, but there are also cultural issues, but I don't have any numbers.
America is much more like Northern Europe. Historically, American kids move out of home as soon as possible, regardless of their income. That's why young adults living with their parents is such a bad economic indicator here. Only the truly desperate would ever do it.
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