I left this one unaddressed -- it's a good question, and would be a perennial issue for all of a post-capitalist political economy.
I happen to be critical of this model, though, on procedural grounds, and have developed and posited my own *more-flexible*, currency-like model that remains non-commodity-production and wholly communist-type -- it uses 'labor credits' that are determined by multiplying labor hours times hazard and/or difficulty, the index for which is derived from mass surveys. The model is introduced and outlined at my blog entry.
communist supply & demand -- Model of Material Factors
