If there are multiple Google AdSense ad units on a web page, it is generally assumed that the top ad unit (the one which appears first in the HTML source code) will serve the highest paying CPC ads. Well, that may be true most of the times but not always. Let’s understand why.
But before you dive into the example below, please watch this excellent video by Dr Hal Varian, Chief Economist at Google, as he explains how an ad auction works and what factors determine the position of AdSense ads on a web page for a given keyword.
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