As pointed out previously, in the US we stock up on things. I've got at least a year supply of TP, and 5 years of shampoo and soap. I'll buy a decade supply of razor blades, for example. I just never want to have to think about those things again.
I end up doing about 1 Costco trip per year, on my parent's membership. The prices aren't really that good. If I had a family of 6 perhaps I'd go weekly since 1-stop shopping is a nice convenience.
We consume less than the average US household, and way less than those of similar income level, but I simply make less trips to get items since I purchase non-perishable consumables in bulk.
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