Guaranteed GRP costs refer to the fixed and predetermined amount that advertisers pay for a specific number of Gross Rating Points (GRPs) in a media campaign. GRPs are a measure of the total audience reached by an advertisement, and the guaranteed cost ensures that advertisers will reach their desired target audience within a set budget. This type of pricing model provides a level of certainty and transparency for advertisers, as they know exactly how much they will be paying for their desired reach. Guaranteed GRP costs are often used in television and digital advertising, and can help advertisers effectively plan and budget for their campaigns.