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One possible explanation I can think of is smart pricing change. I have read in these pages that it is calculated on weekly basis but I am not sure whether its changes are implemented on Mondays. For a favorable smart pricing change I need to have a better conversion rate. That can happen on one of these websites as this is usually the shopping season for its visitors but the same is not true for the other website.
I am posting this here to ask these two questions
1. Does anyone know when the smart pricing change is effected in a week? I know it is "official confidential piece of google information" and no one is supposed to know it, but I am asking about any observations and first hand experience by anyone in this regard.
2. What else can possibly trigger a rise in eCPM? I joined adsense soon after it was started in 2003 and have never seen such a wild fluctuation in its indices (except when my sites are featured on major media channels).
I know that I am taking about an observation based on a very insignificant time period. I really apologize for starting this kind of thread but I am a bit concerned and at a loss of reason for this unusual change.
I've found the following can do this:-
Lots of visitors from countries that give me higher CPM ads
New advertisers in your site's group
Just chance (eg some days are going to be better than others)
An increase in traffic from visitors more likely to click on your ads
Better relevancy of ads (eg rewording pages, using section targetting etc)
Redesign of site ads (eg changing colours, placement etc)
Seasonal variations - eg Christmas, holidays etc
People being on holiday
Been feeling dental pain every Thrusday.
2. What else can possibly trigger a rise in eCPM?
Existing Advertisers pumping in more money
> an observation based on a very insignificant time period.
Right on, give it more time, we all start the day with higher eCPM & EPC, few hours or even days in no indication of anythig, good luck and may may the SmartPricing loose your URL.