Then it cannot work. Every single person in the world has to take the decision to live this way personally and maturely. If even one person rejects it then it is impssible to implement.
Which is why it is impossible to implement. Your theory is far too idealistic and there are billions of people on this planet.
One common problem highlighted with this sharing method is that nothing gets done, but I contend that if I have absolutely all my wants satsified I will do even more for everyone else than before, I'll cook more meals for us to share, I'll help build houses, hopspitals and so on because I would want to share it with everyone, it would be for my own benefit.
Very often given our nature, once we have our wants satisfied then we don't bother with doing much else. And in a way your proposal is also in just. You are implying that everyone receives equally but that is not the case, some will get far more for doing less and others will simply be exploited. Given that resources are finite it is only just that they go to who merits them the most first.
Also take into account that simply working for no money makes one lose the initiative, the bigger the community the less one is likely to feel connected and the more likely it is them to lose the initiative to do the job well.. Your theories have been tried before, they do not work. They go against the way we are biologically.