| http://www.w3.org/ns/prov#value | - Advertisers will invest in it because it is measurable ??? both on the ???way in???, in terms of audience numbers reached by a campaign, which are measured by unimpeachable transaction data; and on the ???way out???, through EPOS data showing sales uplifts, especially using test and control methodology where the only variable between store groups is the screen media.
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