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For decades, the way the TV networks and advertisers worked together was simple. A lot of people watched TV, the Nielsen company estimated just how many, and the advertisers paid for airtime based on the Nielsen ratings. Now, the TV industry is changing and Nielsen is trying to keep up.">@import "/templates/css/mainstyles.css";@import "/templates/css/bucket_alt.css";@import "/templates/css/stories.css";@import "/templates/css/print_stories.css"; metatext/html; charset=iso-8859-1