Can anyone explain CPM and how its calculated/determined?

I understand the ratio between CPM and my earnings but which comes first/determines the other? How can CPM change so much, have one random day with a CPM of over $40 which is much, much higher than my average. How can a spike like this happen?

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Jamie Brock profile image96

Jamie Brock says

4 years ago
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JThomp42 says

4 years ago
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  • ElleBee 4 years ago

    Yeah I knew the abbreviaton but wasn't really understanding the relationship between my views, CPM, and earnings - are my earnings determined by my CPM or is CPM figured out first and my earnings are based on what my CPM is that day?