If you use CJ or any similar sites, this explanation would be helpful. Whenever you select a merchant for promotion the following data would be helpful.

EPC - Earning Per Click (for 100 clicks not 1 click)

EPC 3 months - Earning per 100 clicks on an average of 3 months (the more the better and it shows how steady the advertiser is)

EPC 7 days - Earning per 100 clicks on an average of 7 days (this fluctuates and its better to check out 3 month EPC)...