Why are Japanese very happy people?

This is something that I have observed for a while. I know that they are rich, but Americans are rich too. Is it because of the fact that they have an ethnically and linguistically homogeneous population in combination with one of the highest life expectancies in the world?

>>42
I'm sorry if I offended you sir, it's just that, the person I quoted insulted a great majority of the internet and insulting people seems to be something that Internet tough guys tend to do. I apologize once more, if by any chance the fellow I responded to was not, in fact, an Internet tough guy.