This document discusses how the cost-per-thousand (CPM) pricing model for digital display advertising is evolving to incorporate performance metrics in response to brand advertisers' increasing focus on ROI. It explores how major publishers are offering both CPM and performance-based pricing, how programmatic buying enables dynamic CPMs, and how the push for viewable impressions may lead to viewable CPMs. Overall, the CPM model will still dominate but will grow more performance-conscious over time.