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Hi Fred,
You write:
>  I don't see how one can derive reliable, conceptually
> rigorous estimates of quantities of abstract labor.  
> 
(1) Is there really absolutely no hope of getting some sort of idea of 
the appropriate reduction coefficients? I would have thought that, if 
one wanted to do it, some progress could be made - apologies for 
my ignorance of the work of those on this list who have indeed had 
a go at this sort of thing.
(2) You go on to point out that a number of price magnitudes that 
are 'determined by abstract labour time' can be estimated. Doesn't 
this mean that you *are* able to estimate quantities of abstract 
labour, if indirectly? (i.e. that you cannot *observe* abstract labour 
but you can derive estimates of abstract labour time magnitudes 
precisely because price magnitudes are determined by value 
magnitudes). [Not that you *need* to think in terms of abstract 
labour time as opposed to price]. 
Andy
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