The fee charged by an agency for designing and placing advertisements. Historically, this was calculated as a percentage of the amount spent to purchase space or time in the various media used for the advertising. In recent years the commission has, in many cases, become negotiable, and may even be based on performance of the campaign’s success .

See also:
Advertising
Cost per click (CPC)
Cost per thousand (CPM)
Cost effectiveness
Advertising Research
Endorsement
Testimonials
Trade Advertising