in a world where "violence" would be the name of a a flower, where the need to prove that you're better than the guy next to you would be the punch line of a joke, where food grew itself faster than we could eat it and where all women and all men would be equally attractive and capable of reproduction...in such a world we could live without money...
money has sadly become a key element in the "survival of the fittest" law, and until the human race will reach the next level of intelligence we will be dependent on money, or the general concept of a currency. (my prediction:never, global wipeout at our own hands will come first)