Yahoo lost 11% of its search revenue share to Google during the first six months of 2009 versus the last six months of 2008, per Yahoo's and Google's 2Q09 earnings reports.
- This time period comparison was selected because it represents most of the time period since DOJ blocked the Google-Yahoo ad partnership 11-05-08, where the DOJ concluded that Google and Yahoo had combined market shares of 90% and 95% in the relevant antitrust markets of search advertising and search advertising syndication.
It is relevant, interesting, and instructive to analyze what has happened since the DOJ's 11-05-09 action, and since the economic downturn, given that the DOJ concluded Google and Yahoo commanded 90% and 95% market shares at that time.
This relative revenue share transfer analysis is straight-forward.