'According to a global survey by the World Health Organization, people in wealthy countries suffer depression as much as eight times the rate they do in poor countries, and people in countries with income disparities - like the United Sates - run a much higher lifelong risk of developing severe mood disorders. A 2006 study comparing depression rates in Nigeria to depression rates in North America found that across the board, women in rural areas were less likely to get depressed than their urban counterparts. And urban North American women - the most affluent demographic in the study - were the most likely to experience depression.'
Sebastian Jurgen, Tribe: On Homecoming and Belonging, p.20.