Is the price supposed to be different with a exactly same ads is clicked by a ip from US and a ip from China ?
I think clicks from the US, UK is worth more than a click from Suriname. Yep, clicks from established markets are going to be worth more. Its simple logic.
Clicks from US earns you more this is what I know from my Experience also Adsense Referral say Firefox download from a IP of ur country or Neighboring Country get it only $0.10 but from US it gets ur $1-$2 donno how much