| http://www.w3.org/ns/prov#value | - Marx does discuss in this passage that we can then take abstractions that have a practical truth for us, and look back through history through the lens of these abstractions ??? but he carefully characterises such a move as something that must be done ???with a grain of salt???, because there is ???an essential difference??? between situations in which such abstractions are practical truths, and s
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