Why to use vCpm bidding on Google Display Network
Many advertisers expect viewers will click their ad after viewing them -- but that's not always the main goal. Perhaps you just want a lot of persons to view your ad. During such cases, bidding by cost-per-thousand viewable impressions (vCPM) is a good strategy. With vCPM bidding, you bid for your ad based on how often your ads shows in a viewable position on the Google Display Network.
The advertisers set the maximum sum to pay for viewable ads, even if they're clicked or not.
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