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My Effective CPM drops throughout the day. By the end of the day, it's about 2/3 what it is at the start.
This happens just about every day, and the numbers of impressions and clicks are high enough that it's not just noise.
I'm guessing it's because people from different time zones access different parts of our site at different times of day, and the early people click on more high-paying ads than the later people.
Has anyone noticed a similar effect? Anyone seeing the opposite? If the above theory is correct, I'd expect to see some variation among people in this forum, including quite a few whose Efffective CPM rises during each day.