| http://www.w3.org/ns/prov#value | - Aristotle made a distinction between natural and non natural slaves, arguing that only the former should be kept as slaves, whereas Plato is often quoted to have said that Slavery is a system of the most complete injustice., but in fact the society he describes in Laws have a separate slave cast, as explained http://philosophy.stackexchange.com/questions/468/what-were-platos-view-on-slavery-
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