Check out Zeitgeist-Addendum
http://www.zeitgeistmovie.com/
It portrays the role of money in our world, its destructive ability, and what it could be replaced with. Do you work for money? Or do you work for the satisfaction that your work brings you? Few have the privilege of doing what they like to do, but with technology as it is, isn't it possible? The movie speaks to this also. Check it out.

Thanks Maxwell_Smart, I've seen Zeitgeist and the Addendum, they are great.

Or maybe people create an economy in order to exist.

Well said!!