Quote from callmeput:
Do you think that a world where there were a limit of how much a person could own would work?
No one is allowed to own more than let´s say $500 000. The rest is put in a basket and shared with everyone on this planet.
Okay, I'll run with your idea a little bit... let's say you made your $500,000. After this point, why would you continue to work? In fact, why would you work in the first place? If you just sit on your ass long enough you'll get free money from this "basket."
Except there's one problem. There's no money in this basket unless you believe the general population is so altruistic that they will continue to work for free after they've made their half mil.

(yes and maybe do a little volunteerwork here and there, because the world would be an entire mess, with mass poverty etc.)