The AdWords system will calculate the effective cost-per-thousand impressions (eCPM) for an ad entering into an auction for the Google Display Network when there are:

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The AdWords system will calculate the effective cost-per-thousand impressions (eCPM) for an ad entering into an auction for the Google Display Network when there are:

Answer -  both CPM and CPC ads entering the auction
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.