Let's calculate the CPM to determine the relative costs for these mediums, first.

Ed

What does CPM stand for?

It means cost per thousand, and it evaluates the relative cost of the media that represents the cost of exposing $1,000$ members of the target audience to an advertising message.

It means cost per million, and it evaluates the relative cost of the media that represents the cost of exposing $1,000,000$ members of the target audience to an advertising message.