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[–]magnora7 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

"How many $Y did customers give me thanks to $X spent on advertising?"

The problem is, it can be very hard to isolate which people came because of the ad and which came naturally.

[–]danuker 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

It might be hard to implement, but if users are clicking on ads, you can have an URL parameter like "?from=saidit", then track the users via IPs, cookies and/or user agent until they either leave or order something.

Figuring out where the users "leak" away is called "funnel analysis".