2009 book, The Spirit Level, they discovered that it is national inequality, not national wealth, that most influences nations’ social welfare. More unequal countries, they found, tend to have more teenage pregnancy, mental illness, drug use, obesity, prisoners, school dropouts, and community breakdown, along with lower life expectancy, lower status for women, and lower levels of trust.17 ‘The effects of inequality are not confined to the poor,’ they concluded;
