Which buying mechanism used by larger advertisers incurs high costs and is priced on a cost-per-day format?

The buying mechanism that incurs high costs and is priced on a cost-per-day format is the masthead. A masthead is an advertising placement that appears prominently at the top of a webpage, typically on video platforms like YouTube. This format allows advertisers to gain significant visibility and engagement by occupying prime digital real estate for a full day, which leads to higher costs due to its premium positioning.

Advertisers who opt for masthead placements usually have substantial marketing budgets as they aim to drive mass awareness, product launches, or large-scale campaigns. The cost structure reflects the value of this high-visibility space, where advertisers pay a set fee for daily exposure rather than per click or impression. This is distinct from other mechanisms, where pricing can vary based on engagement metrics such as clicks or impressions rather than a flat daily rate.