The document discusses three different mobile advertising payment models: cost-per-install (CPI), cost-per-click (CPC), and cost-per-mille (CPM). It outlines the pros and cons of each model. CPI pays for installs and has low cost but limited tracking. CPC pays for clicks and is more insightful but requires optimization. CPM pays for impressions and works for rich media but risks low quality traffic. The document encourages understanding the differences between these models.