Richard Wiseman‘s research on luck made me realize the adjective happy-go-lucky is literally true.
One of his findings is: “Lucky people are more relaxed and open, and therefore see what is there rather than just what they are looking for. “
I translate this as happy-go-lucky people are happy and lucky.
The interesting conclusion to the article is his Lucky School teaching the lucky attitude. It can be learned and it will make you happier and luckier.