Ever wondered why you use the log of income?

I have found this very nice explanation.

http://thesocietypages.org/graphicsociology/2010/12/07/1247/

You know, often you get stuck in a boring routine, without wondering why you are doing what you are doing (expecially when you are at the beginning of your academic career). This is a remainder: never stop to ask yourself the fundamental question “WHY?”.