Happiness in Economics
From Dickinson College Wiki
What is Happiness?
Simply Textbook
Most economists take it as a matter of course that higher income leads to higher happiness. And why not? A higher income expands individuals' and countries' opportunity set; that is, more goods and services can be consumed. The few people not interested in more comodities need not consume them; they have the freedom to dispose of any unwanted surplus free of charge. It therefor seems obvious taht income and happiness go together (provided, of course, that the two are correctly measured).