I came across http://en.wikipedia.org/wiki/Suicide_in_Japan when I was reading about Japan on Wikipedia. It led me to http://en.wikipedia.org/wiki/Shame_society which says that the high suicide rate may be attributed to the societal structure. These societies set high standards for individuals and that may result in high performance from the society but, at the same time, may depress under-achievers to such an extent that people commit suicides.