New internationalist reports in a graph that high mental illness rates are tied to high income inequality.
for example countries like Japan, Germany and Spain which have low to medium income inequality show only 10% mental illness. Countries such as the US, Britain and Australia with medium to high income inequality show 25% of mental illness.
See graph: http://newint.org/features/2012/11/01/healthcare-infographic/
"Helathcare, Health and Inequality: the facts," New Internationalist, November, 2012. http://newint.org/features/2012/11/01/healthcare-infographic/