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system
if there's no volume discount, does buying in bulk still make sense?
user
let me add a counterpoint.  i don't know about you, but for some psychological reason, when i know i have an abundance of something i tend to be less frugal about the way i consume it.  for example: when there is a six pack of cokes in the fridge i feel like i am more prone to not drink them up so quickly so i have some for later on. however, if i knew i had 3 more cases in the pantry, i seem to go through a lot more of them.
assistant