The Spirit Level provides more social science documenting the obvious. Just as out-of-school effects trump schools’ and teachers’ contributions to learning, equality and inequality trumps economic wealth in creating a livable society. Americans living in more equal states live around 4 years longer than those living in more unequal states.
Similarly, "Unicef measured six different aspects of child well-being. Material well-being included such things as living in a home with few books, or where no adult was employed. Health and safety included items like immunization rates and deaths from accidents. Educational well-being included scores on performance tests and the proportion of children going into further education. Peer and family relationships were measured by such things as whether or not children viewed their peers as kind, and the numbers of children living in single parent and step-parent families. Behaviours and risks included smoking and drinking, how many children had sex by age 15, etc. Subjective well-being included self-rated health and other measures of how children felt about themselves."