| http://www.w3.org/ns/prov#value | - Rise of Nations had done something similar with their increasing-costs per each unit of a type built, but those were irrespective of technology levels so far as I recall -- it made you have a reasonably balanced army (unless you were really resource-rich), but it didn't make you use older tech in addition to the new.There were many other advantages to this system, such as making the acquisition of
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