For a managed dCPM buy, actual cost data MUST be obtained from the?

In a managed dCPM (Dynamic Cost Per Mille) buying scenario, obtaining actual cost data from the vendor is critical because the vendor is typically responsible for delivering the inventory and serving the ads. They provide the insights necessary to assess how effectively the media is being utilized in relation to the costs incurred.

The vendor has access to real-time data regarding impressions served, along with costs associated with those impressions. This information is essential for measuring the efficiency of the campaign and understanding the true cost incurred per thousand impressions delivered. Additionally, the vendor may provide reporting tools and dashboards that facilitate a clearer view of performance metrics and spending.

While other roles like campaign managers or traffic managers play crucial parts in the execution and oversight of media buys, the vendor is the definitive source for cost data specific to the media inventory purchased and the pricing dynamics that apply to it. Their involvement ensures that the data you're working with is not only accurate but also aligned with the contractual agreements that may exist between the advertiser and the vendor.