Let's face it: most of us spend money on things that are entirely unnecessary. We buy gadgets we don't use, books we don't read and experiences we don't even remember. If you won't remember something in a week, don't bother spending money on it.
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As personal finance blog The Simple Dollar explains, if you won't remember something you paid money for after a week, that's probably a good indicator that it was a waste of money. Buying books is great, but if you've already bought twelve this week, you're probably going to forget the thirteenth. Add it to a list if you don't want to forget, but don't buy it until you know you won't forget it:
This is perhaps the biggest lesson I've ever learned about personal finance. If it's an item or an experience you won't remember in a few days, you shouldn't be spending any money on it. If it's completely forgettable, then any money you spent on it is basically just lost. The only completely forgettable things you should be spending money on are your most basic life needs — basic food, basic clothing, and shelter.
Of course, that doesn't mean you can never spend money on something you're not sure you'll remember. I regularly watch movies I'm not sure I'll enjoy because I may like them. However, when you know that you don't have time to use an item, or you don't care about a particular experience, that's as good a filter as any to determine whether you should really be spending money on it.