Ask HN: CPM - Eyeballs vs Impressions

Hey guys,

I have seen CPM referred to as both cost per thousand eyeballs and cost per thousand impressions (or pageviews).

I am confused. An eyeball can result in multiple impressions/pageviews, so how are cost per thousand eyeballs and cost per thousand impressions the same thing?

Basically, if 10,000 visitors (eyeballs) result in 100,000 pageviews (impressions), will a CPM of $1 result in $10 or $100?

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