Audience is the equivalent of circulation when talking about broadcast media. Audience size varies throughout the day as people tune in and tune out. Therefore, the price for advertising at different times of day will vary, based on the audience size that the day-part delivers.
CPM (Cost per thousand)
CPM analysis is the method media buyer's use to convert various rate and circulation options to relative terms. CPM represents the cost of reaching one thousand people via different types of media. To ...