There's certain foods which are useful to have in larger amounts, and there's certain foods which are perishable. It makes sense to ensure you have some supply

There's certain foods which are useful to have in larger amounts, and there's certain foods which are perishable. It makes sense to ensure you have some supply of the former, and it makes sense there's on short-term a higher demand than supply for these. For perishable products, it does not make sense, though I myself own for example a dehydrator with which I'm able to ensure perishable foods become less perishable.