How are the prices of TV commercial time slots determined?

How are the prices of TV commercial time slots determined? commercial slot
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commercial slot car track for sale Commercial Belgian Waffle Maker 4 Slot with 2 Year Round Waffle Maker Machine Muffin Maker Commercial Nonstick Electric Steel 110v : : Home Ad Slot Prev Next An ad slot is an actual space within a website where advertisements are displayed To populate this space with an ad on a web page, it