There is another important information towards the end of the article: different cultures have different connotations of "happiness" -- high arousal positive state (enthusiasm or excitement) vs. low arousal positive state (calm and serenity). The latter can be held for a long time, the former can not.
Not only different culture. Even different age groups of the same culture have different notions.
http://www.alternet.org/print/books/youre-making-your-depression-worse-self-help-bringing-us-down
TL;DR:
results in a positive feedback loop pushing people into depression.