Ad Size: On average, larger ad formats have a higher CPM because they are more prominent and more likely to encourage user action. However, the most common ad sizes, if not the largest, generate higher CPMs.
Ad Viewability: The definition of bolivia phone number library viewability depends on the ad format, but for display ads, Google defines viewability as at least 50% of the ad being on screen for at least 1 second. A publisher with a low viewability score will see their CPM rates drop significantly.
Past Performance: Advertisers value traffic quality and are willing to pay higher CPM to place on sites that convert and provide a higher ROI.
Number of Ad Units on Page: Having more ad units on a page will lower CPM rates. A larger supply will result in lower bids for those ad units.

Seasonality: Traffic has some seasonality across industries, which leads to changes in CPM rates. Summer can see a decrease in spending, especially in Europe, with many people taking time off work for holidays.
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