I'm a 'stocker.' When I see a great deal on something I know can use, I tend to buy multiples e.g. tomato soup, 24 cans. Luckily I have storage space. Now that there are only two of us at home, I no longer can but will still put potatoes and onions 'down cellar.'
During the winter of 1977-78 the only way I got to the grocery was on foot, with a sled for the supplies. Now our nearby store has closed and I don't think I'd want to trudge to the new one. So I lay in the staples, just in case: yeast, flour, canned goods, frozen food, powdered milk, dry beans, rice, etc. and don't forget the t.p.
My so-called stash has more sewing factory cut stacks, project remains, thrift store finds and old jeans than yard goods from the quilt store. I have made quilts with new fabric, purposely selected, but I prefer the thriftier up-cycling.
We don't have left-overs, we have planned-overs and think the pot of green beans or vegetable soup or pot roast & gravy taste better for the reheating.