Which of the following is a popular commission model?

The choice of Cost Per Acquisition (CPA) as a popular commission model is highly relevant in performance marketing. This model allows advertisers to pay only when a specific action is completed by the user, typically involving a purchase, signup, or other defined conversion. The appeal of CPA lies in its efficiency; advertisers align their spending with tangible results, ensuring that their investment directly correlates with the success of their marketing campaigns. This model provides a clear ROI, making it a preferred option for many businesses seeking to optimize their advertising budgets.

In contrast, the other commission models, while also widely used, serve different purposes and may not align as closely with direct conversions or the measurable success of campaigns. CPM focuses on impressions and may lead to higher costs with no guarantee of engagement or conversion. PPCall centers around driving phone calls, which may not always translate to sales depending on how those calls are handled. CPI relates specifically to mobile app installations, which is limited to a certain type of service or product and may not encompass the full array of marketing objectives that CPA addresses.