>>12651“Whether the value of cotton rise from one shilling to two shillings, or
fall to sixpence, the workman invariably preserves in the product of one hour
only one half as much value as he preserves in two hours. In like manner, if
the productiveness of his own labour varies by rising or falling, he will in
one hour spin either more or less cotton, as the case may be, than he did
before, and will consequently preserve in the product of one hour, more or less
value of cotton; but, all the same, he will preserve by two hours’ labour twice
as much value as he will by one.”
This one I don't understand. Is this one talking about the limits of productivity or something like that?