system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do dollar stores work?

I sometimes see name brand stuff in the dollar stores and they aren't expired or near the expiration date so how can dollar stores get away with selling things for so cheap whereas other store sell them much higher?
gpt
Usually dollar stores will sell smaller sizes of that item, i.e. 1.5oz of deodorant vs 3oz, which is the 'regular' size.

But you wouldn't notice that because you see the '$1' sign, whereas you might be paying around $2 anyways, or even less, on the 3oz deodorant.

Other reasons could be that the items are second-grade, meaning that they have been deemed not to sell as well in grocery/department stores in that condition. The items are still perfectly usable, but their packaging may have suffered.

Or possibly the dollar store companies will take a hit on their profits in order to maximize revenue/market share.