I'd bring up the oft-cited example of the Pilgrims attempts at collective farming. That's if I hadn't seen a Christian collective actually work. They are often called "The Twelve Tribes" although they refer to themselves collectively as "The Body" as in the body of the church. Individually they refer to themselves as Disciples. They have grown to be an international phenomenon. When I was with them there was never a lot of extra cash around but now they are legit wealthy. They are worth checking out.