It just dawned to me that there might be a weird relationship between happiness and money.
At first you are happy without having any money, than you get some dollars (or other currency) and you start losing happiness. You start worrying or yarning for special, expensive things or services.
But as you get more and more money, your happiness factor increases again.
I’m sure that it’s not a new idea and that the real shape will have slopes of different degrees. However, the trend should be true: starting high –> down –> returning up.