david_uk - 8:45 am on Nov 6, 2005 (gmt 0)

The advertiser may have geotargeted the ads. So this might mean a click from the US is max valued at $1, a click from Canada has a max of $0.50 while a click from UK is max of $0.25. So a click on the same ad could produce a great variety in earnings simply dependent on where the visitor who clicked is located.

If the advertiser has geotargetted the ads, shouldn't they be showing in only the places the advertiser had targetted?

I know that advertisers will often opt for a global campaign, even though the geotargetting option is more sensible for them based on what they are selling. I have always had the feeling based on watching stats arrive as the US sleeps that if an advertiser has opted for a global campaign, clicks from the other side of the planet are discounted. In some ways that makes sense to me. Are you, or ASA able comment further on this?