What does CPM mean?
CPM is an acronym standing for "Cost Per Mille". "Mille" stands for "one thousand". So, "CPM" represents your cost for one thousand displays! If you had a CPM of 5 cents, then you know that 1000 displays would cost you 5 cents, and 5000 displays would cost you 25 cents.
Project Wonderful sells advertising space in terms of cost per day, which is different from CPM. However, we can convert to CPM by taking the cost spent and factoring in the displays achieved over this time. So, while you're not charged by the display, you can still see the effective cost of every display!
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