Media Buying 101: What It Is and How It Works [+15 Platforms to Use]
Hubspot
APRIL 2, 2021
RTB is not the only way to purchase impressions, you can also use private marketplaces, in which publishers limit who can participate in the auction. Another option is called programmatic direct, in which ad inventory is sold at a fixed cost per thousand impressions (CPM) with no bidding. Google Display & Video 360.
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