I think the thought experiment of achieving marginal cost per job higher with human than machine for all jobs is best explored with the pathway there. Machines will not come into existence in a blink. Real-world concerns like manufacturing capacity and power will constrain the pace of building. (In the event they don’t, we will be grey goo).

Given that, the question becomes what happens in the intermediary period and whether that period will last very long.

You have to contend with my utility function in that period which prefers maximum leisure over Commissar Wilson’s Labor Corps. Either you let me have the machine that outcompetes everyone else for the things I want done and I don’t enter your CWLC or that thing I want done needs a human and I will exchange something I have to get what the other has and reinvent market economics the hard way on the black market if required.

Put simply, commissar, I don’t want to work or understand my economy so unless machines arrive in a blink and place you on the throne, the fact that you want that has no bearing on what will occur through the transition because there are more of me.