Who defines greed?

I've been fascinated with the Occupy Wallstreet Movement and the use (and sometimes misuse) of the word Greed. Per Webster, greed is, "an excessive desire to acquire or possess more than one needs or deserves, especially with respect to material wealth."

From the greediness man in film.

Another short clip from Milton Friedman on greed and capitalism. Who is more greedy, the capitalist in pursuit of the dollar, or the bureaucrat in pursuit of power? Are they one in the same?

After some browsing, I came across this article All About Greed | Foundation for Economic Education. It's well written.

Final thoughts - Who's decides how much is too much? Outside my faith and my parents, should it be anyone else?