You're glossing over some main factors of importance, namely these:
I'll readily agree that my formulation is a novel one, but it's from having hashed out the implications and logistical particulars that result from the communist position.
So, in brief, there's no reason why a liberated world population *shouldn't* negotiate on a person-to-person, small-group-to-small-group, or mass-grouping-to-mass-grouping basis, as long as all assets and resources have been fully collectivized *and* the definitions of 'hour' and 'difficulty and/or hazard' can be standardized in a consistent way.
In a communist context the only economic variable -- also a fundamentally material one -- would be that of a person's (liberated) labor, so that reality is reflected in my 'communist supply & demand' model.
No, 'labor credits' is *not* wages, because 'wages' implies that labor is being treated as a commodity. There is no good reason for labor to continue to be treated as a commodity. Only a *liberated* labor should co-determine how liberated labor is to be exercised, for collective, mass-available, ends.