For An Ad Entering An Auction On The Display Network, The Google Ads System Will Calculate The Effective Cost–Per–Thousand Impressions (ECPM) When There Are:

any cost–per–click (CPC) or cost–per–acquisition (CPA) ads entering the auction only cost–per–click (CPC) ads entering the auction only viewable cost–per–thousand impressions (vCPM) ads entering the auction both cost–per–click (CPC) and cost–per–acquisition (CPA)

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