What is the only objective way one can compare two different forms of media?

Question

Quizplus · Accepted Answer

Cost per thousand (CPM) is the only objective way to compare two different forms of media. CPM refers to the cost of reaching a thousand potential customers with a specific form of media. This allows advertisers to compare the cost-effectiveness of different media channels, regardless of their form or format. Sanitation method, outsourcing, and agency fluency are not relevant factors when comparing different forms of media.

What Is the Only Objective Way One Can Compare Two