I only ever buy stuff I need as I need it. As far as I'm concerned, necessity is the mother of all shopping sprees.
Women will tend to go out without anything particular in mind though, they'll browse and buy a load of stuff that they didn't really know they wanted before they went out. And I think that way they render themselves a lot more vulnerable to adverts, marketing, and sales pitching.
I don't think this particularly means that they buy things they don't need, they just shop in a different way to guys. What is nonessential to one person can be like oxygen to another, too, and yet again women are different in this department, so I suppose a lot of what men see women buying could easily seem like junk when it's actually stuff that women really need.
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