I have just create a commission juction account but I don't understand many stuff. What is 7 day EPC ? What is 3 month EPC ? thanks
You should use google for any terminology questions you have like that. EPC is just an average of how much was earned per 100 clicks over a given time period. So if the advertiser's 3 month EPC is $54, then on average people have been earning $54 per 100 clicks they send to that advertiser. That doesn't mean that's how much they pay for clicks, because they don't pay for clicks at all. You can make $200 EPC on a program that only shows an EPC of $7, and the reverse is possible as well.