http://www.w3.org/ns/prov#value | - Example, the cost of maintaining and repairing highways and other roadways is conveniently forgotten by the anti-rail people so if you are talking about establishing a light rail system it is legitimate to compare to the cost(s) of establishing alternative transportation systems - such as automobile/highway system. (do not forget to include inflation -- a billion do not buy as much as it used to.)
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