Many UK advertisers have recently received correspondance from Yahoo regarding the launch of a new ranking model (of which Panama is a step away from the traditional bidding system used by Yahoo), which bases positions of adverts on a number of criteria other than merely cost per click
A rough outline of the new algorithm could be outlined as follow (with positioning based on a eCPM)
(Cost X CTR) * 1000 x (?) = eCPM
Other criteria obviously goes into this equation and this is in its simplest form, however it does provide a basis for the Panama algorithm (according to a recent rep I spoke to)
However back to the e-mail, which goes on to state
“Sponsored Search system will be rolled out in the UK soon, beginning with advertiser migration later this quarter.&r...