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If there's no volume discount, does buying in bulk still make sense?
As with everything else, it's a question of trade-offs. Pros For Buying In Bulk Cons For Buying In Bulk Inventory cost. You need to purchase more shelving/cupboards to stock the goods.  This is a real cost. The psychological effect of having more means you are more likely to use more, thus costing you more. Deflation of the cost of the item should occur over time in a well-functioning market economy.  A $10 item today might be $9.50 in one year in real terms. There is a real opportunity cost associated with overbuying.  Granted, an extra $100 in your bank account won't be earning too much if you have to spend it one month later, but it does mean you have less financial independence for that month. Risk of spoilage.  There is a nonzero risk that your goods could be ruined by flood/fire/toddler/klutz damage. You need to decide which of these pros and cons are more important to you.  Financially, you should only buy what you need between shopping trips.  In reality the convenience of holding goods in storage for when you need them may outweigh the costs.