How much do video ads cost?
... How much you'll pay depends on which pricing model you choose:
Cost-per-click Pricing (CPC): Text Overlay, In-Video, Click-to-Play
If you choose to target your text ads to the Content Network or to videos within the Content Network, you can choose CPC pricing. This means you'll set a maximum bid for each click on your ad and set a budget limit for overall spending for the campaign containing those keywords. You'll pay when a clickthrough leads users to your ... [full article
"official document on pricing model of google video ads..." - mf
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