August 20, 2009
Google Chief Economist Says Conversion Rate Doesn't Vary Much by Ad Position
Google's Chief Economist Dan Friedman Hal Varian and his team have conducted research on whether ad position affects conversion rate. Their conclusion is that it doesn't much. I have a feeling "much" is subjective among SEMs.
Their research showed that for search results pages with 11 sponsored ads, conversion rates "only" varied 5% from first place to last. So, if an ad gets a 1% conversion rate in the first place, the worst it would get is 0.95%.
Friedman Varian wanted to emphasize that ad position is affected by ad quality. Therefore, ads with higher ad position are likely better quality and more likely to have higher conversion rates. In other words, don't compare apples to oranges when testing ad position. You would need to test the same ad across various positions.