I don't understand how using analytics can tell you the return on investment of your adwords campaign for commission junction or other affiliate links in real dollar terms. How could it do that if your just using an affiliate link. Wouldn't that information only be known to the affiliate? Are you telling me that if I put a commission junction link on my landing page, analytics can tell me how much money i made off it? Or what exactly does it calculate when you use adwords in conjunction with analytics?