| http://www.w3.org/ns/prov#value | - Of course, labor is necessary to exchange, as it is to the utilization of the reproductive forces of nature, and the produce of exchange, as the produce of agriculture, is clearly the produce of labor; but yet, in the one case as in the other, there is a distinguishable force co-operating with that of labor, which makes it impossible to measure the result solely by the amount of labor expended, bu
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