Its hard not to be cynical when talking about an eutopian society. It would be nice if people could just get along, that we didn't covet what someone else has. But the truth is the ones that covet tend to rise to power more than the ones who wish to live an ethical life. Even if you were to rid the world of a monetary system there would still be more people who would find ways to exert there control over the less fortunate.
I wish it wasn't so but it seems to be part of our evolution.