The purpose of this lesson is to continue building upon the application of ratings and impressions as the currency to evaluate the efficiency of programming vehicles and media, in general, as they relate to pricing and delivery of audiences. In a previous video lesson, you learned about ratings and impressions. In this lesson, we will go deeper and understand how to apply these audience measurements to pricing and negotiating cost or rates to broadcast airtime, specifically. When I say cost or rates is the cost for, say, a thirty second commercial to air in the commercial break of a given program.