system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do dollar stores manage to sell brand named products for such a low price?

2 liter bottle of Coke for a $1 vs. the same drink for $2.50 a grocery store.
gpt
Dollar stores generally operate on a high volume, low margin basis. What this means is the store attempts to sell many more items per day than a large grocery store but receive less profit per item. They rely heavily on buying from wholesalers at low cost and having very little operating costs. 

You may also notice that many dollar stores carry very few or no perishable goods. A large grocery store may require extra profits on items like Coke because they may have to discard the $200 of turkey meat that is now expired and no longer salable. 

There are many other factors that can contribute to the sales price, however. Some Dollar stores are large chain franchises that heavily utilize economies of scale to obtain large price cuts from wholesales. Small Dollar stores generally rely on low financing costs.