1. Check whether you really want to buy this (or whether it is rather an idea than the actual product that you feel drawn to).
2. Check whether you really want to buy this (or whether it is better to rent it, for example).
3. Check whether you really want to buy this (or whether you want something else more than that).
4. Check whether you really want to buy this.
The first three steps are for everybody. If you don't act upon them, you are simply throwing your money in the trash. And letting trash into your life.
Step four is the only minimalist one. What the real purpose of acquiring something is, differs from person to person.
Maybe you know you are happy already, and therefore only buy stuff that you really need. Even if you feel a desire to have it, you might decide to let it be then.
Or maybe you want to buy only stuff that you truly benefit from. And when you discover you want something that does not actually contribute to this objective, you just don't buy it.
In any case, make sure you consider steps 1-3. If not, you're out of your mind.