Good points. I don't know, I genuinely don't know yet; this problem is by far the biggest obstacle in the face of a non-capitalist economy (all the rest require more easily conceivable technological and institutional infrastructure). Still racking my brains...

So do you have any evidence this is doable, because right now you sound like the crackpot saying "my perpetual motion machine will work just as soon as I figure out a way around the second law of thermodynamics".