Often only a few ads will be shown on a search query that seems like it should have many ads. Google claims that reason for this is because they only show ads with high 'relevance'. The real reason, though, is much simpler. [...more]
The formula for AdRank is so simple that it's surprising how frequently, and grievously, people can sometimes get it wrong. The purpose of economic activity is to maximize profit, not Quality Score. So, when the two are in conflict, choose the lower QS. [...more]
Google makes it clear that an ad's clickthrough rate (CTR) is the primary component of its Quality Score (QS). But one question which search marketers frequently overlook (and one for which Google has offered only a superficial answer) is: Why? [...more]
