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?

>>46
Well sir, I am glad I could have such a fine discussion with you this evening. Unfortunately, I feel it is time to get some sleep so I can get up for classes in the morning. Sleep well good sir.