Erin Skinner taps into a Google video staring Chief Economist Hal Varian to explain how Google determines Ad Rank and an advertiser's click cost. The post might make you feel like you're back in high
school math class, but Skinner carefully explains each process with charts and examples.
He writes that "the main takeaway that I hope you see underneath all these numbers is that
keeping a strong quality score is the key to lower costs and better positions."
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