Yeah it sounds very complication right, but it is instead very simple. Compulsive Buying Disorder is like an Obsession of Buying New Things. It's like an Addiction which is triggered whenever you go to a Market or someplace Fancy.
Now don't get it mixed up with people who Buy stuffs Normally. You can check out for yourself if you have this Disorder or not by going through all the stuff you have in your Closet and think if you need all that stuff or have you even used some of the Stuff you Bought. If you have stuff lying around which have never been used my guess is you have a Buying Problem.
Now as Complex as the name sounds you can easily cure yourself out of this. As I have always said on my Previous Posts the first step to curing any Addiction is to accept the fact that you are Addicted.