Table:Paid placement in metasearch engines. what percentage of
the links shown on the first page of results from a meta search
service were paid listings. The table shows what percentage of the links shown on the
first page of results from a meta search service were paid
listings. The search query was "canada," done using each meta
search service's default settings.
http://www.searchenginewatch.com/sereport/01/05-metasearch.html