Pricing for non-guaranteed, or remnant, ad inventory rebounded last year, with average display ad CPMs up 111% from 2008. Ad network optimization company PubMatic, which provided the figures,
attributed the gain to factors including the emergence of real-time bidding, the rise of demand-side platforms and improved international monetization.
PubMatic says findings from its Ad
Price Index are derived from data collected from a large number of premium publishers and analyzed by independent statisticians. Pricing data reflects net publisher monetization for non-guaranteed ad
inventory via ad networks and excludes networks' share of ad spend as well as inventory sold directly by publishers. --Mark Walsh