Well, ideally, such concepts as "price" and "currency" should never have existed, as people would freely invent with any tools at they disposal, and distribute their inventions among society for it to use them to produce, invent, and progress further along the way. The main factor (or should you say, 'bet) of this model is that humanity would fully understand that it needs to progress further, not stop and delve into laziness and anarchy because everything is available for free. And humans, in my opinion, are (or more like "were") capable of realising that by just having everything you need will not move the humanity further, you need to use what's given to you, not laze around.
So the humanity would have been shaped into a well-oiled work machine, moving only upwards, not burdened by some oligarchs amassing power and wealth and supressing others.
It's just that it is very hard, if not already impossible, to realise this in present society. That's why communism in USSR failed — it wasn't truly communism at all, as there still were some people "more equal than others".