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If there's no volume discount, does buying in bulk still make sense?
There is a trade-off. It can be worthwhile because you save those extra trips. (On the other hand, don't you need to go shopping all the time for perishable items anyway?) On the other hand, having those items on stock implies inventory costs (the space they take up might be limited, the money they represent is sleeping and cannot be put to other usage, some of them might break...). This trade-off gives you the economic order quantity. Your stock levels over time based on that would look like a saw-blade. In addition, you might want to keep a safety stock for emergencies (if you use them faster than expected, if there is a supply shortage...).