While affluence is a terrific thing, compared to poverty, it does have its downside: too much stuff. “Too much” can mean not being able to find what you need, because all the extras are in the way. “Too much” can mean additional expenses: storage fees, bigger rent for a larger home, buying things you know you have but can’t find, medical costs from tripping over the excess. . . .
Once you have enough clothes, enough dishes, enough canned goods, enough pots and pans, the next step is to limit the proliferation. “Enough” means different things to different people. Decide what your enough is, then stick to it with the one-in-one-out system. Tempted by that new shirt? So, is it really better than the shirt you’d have to give away if you bought a new one? If so, great. If not, you just saved the cost of a new shirt and saved yourself from a closet so crowded it’s hard to find anything.
One advantage of this system is that it makes us stop and realize how great the stuff we already have is. That contributes to peace of mind and positive mood, besides saving money.