money has not allowed humanity to grow as one, ever, it always as been a way to segregate and keep an elite healthy, and money did not remove the trade system, it is just that you trade for money, there is still not agreed values, else capitalism as failed (well it has, surprised?) i have read somewhere that in a few places the 1st form of bankers got lapidated to death because, well they went ahead and start money making schemes. until governments understood they could take control of that and become even more powerful.
But rich people and elites have existed from before a common currency was created. And luxuries too. For example if I was a peasant and only had vegies to trade and I want some game meat, tha meant trading 10 coliflowers for a pice of meat, but if you had chickens you only had to pay 2, but how many chickens do I get for my vegies?? (I hope I make my point here).
Money is a physic form of an abstract concept which is the common value of an item. When I say
"a price we all agree to" I don't mean we all decide the price, rather we all pay the same amount for it. So now a piece of meat is worth X, a chicken is worth X/3 and a cauliflower X/8. And we all can get it through the medium that is money.
And I understand the fact that the value of money fluctuates and so do prices, inflation, economic crisis, etc, But is beyond my point.
Capitalism is a delicate system. I don't understand what you mean by that it has failed. I don't think it has, capitalism is about selfgeneration of wealth and property. It's a very unfair system, money certainly can bring forth the worst in people, but there are those who have money and help those who doesn't. That's why I don't think money or capitalism are at fault of the errors of humanity, only humanity can be.