TIP#25: Do not need list

In my Book 25 Tips for Productivity I get into detail on this list, but it is basically my tool against consumerism and myself. I write in this list all those things that I don’t need that I will try to convince myself that I should buy. (more than what I am going to admit)
This list is a key for me, to not buy unnecessary stuff. There is stuff that I want to have, just because. That stuff is in that list.
i.e. The Convertible, two doors is in that list. Had a convertible already. The image in my mind of the convertible, never match the reality in my case, but for some reason, I often think I should get one.