What does it take to be happy? About $75,000

Same topic, many articles:

http://news.ycombinator.com/item?id=1668979

http://news.ycombinator.com/item?id=1668909 <- This one

http://news.ycombinator.com/item?id=1668478

http://news.ycombinator.com/item?id=1667603