Benchmarks media costs, supplier terms, inventory quality, volume commitments, make-goods, rebates, payment terms, and procurement efficiency. Use when evaluating media supplier negotiations, annual volume deals, rate cards, platform costs, publisher proposals, or whether media buying terms are commercially competitive. Also trigger when someone says "is this a good rate?", "are we overpaying?", "evaluate this media proposal", "compare publisher rates", "review the IO", "negotiate the deal", "assess this rate card", or when media-routing-planner routes here to validate carrier/supplier terms. Even casual phrasing like "is this CPM right?", "should we take this deal?", "wh…