It's also interesting to keep shoppers psychology in mind when considering store layouts. There's a reason that place related items far away from each other in order to get you to see the higher-margin and higher-priced items they really want to move. I learned about this when I stocked shelves at a supermarket.
I also agree in the bulk buying that you mentioned, and it's something I started doing a few years ago when items were on sale. You can save a lot of money by knowing what to buy, and when to buy.
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