Earlier quoted context omitted.
If people keep suggesting solutions that were tried and failed of course other people will point that out. 1930-s Gosplan, 1950-s Gosplan, OGAS, Cybersyn, they all failed. Come up with something new maybe?
Cybersyn was an experiment and we don't really know if it would have worked or not because the USA arranged for a military coup to destroy it ...
"trading" was ideologically prohibited term which didn't help any.
And the whole centralized approach cannot scale.
So there you have it: it can't work, please bring new ideas.