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With respect to the # of impressions your ad will see on a daily/weekly/monthly basis, is there a significant drop off from position 1 - 2 / 2 - 3 / 3 - 4?
On Google searches your ad would be displayed for each instance. But doesn't Google farm out 'search' ads to other sites without those sites being within the content network? If so, does anyone know if how position will effect the # of impressions.
For example, site xyz only displays the top 2 advertisers, so if your number three or four your out of luck.