Hi there! I'm a bit new to Hubpages and I was wondering what CPM means? I understand that it's cost per thousand impressions (I can use google haha) but why does it fluctuate? Is there anyway to keep it high? Thanks for your help!
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Actually, and I could be wrong, but I think the M im CPM is roman numeral for thousand. So you are right that it means per thousand, but it doesn't stand for cost per million. So hows things going for ya?