Brian wrote: In regards to

Of course different quantities of the same use-value can be compared in a single unit, whether that be number, weight, volume or whatever. What cannot be compared in a single unit are, for instance, steel (tonnes) and electricity (killowatt hours).Calculation in kind  will be calculation of the various use-values used (or useable) in production, but in their specific units, not in a common unit such as value and money as under capitalism. As a matter of fact calculation in kind (ie in use values) already occurs under capitalism, only it is duplicated by calculation in money. In socialism we will dispense will calculation in money and calculate in kind and make decisions on what to produce and how on this basis.