system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is amazon so cheap?

How is I can buy something on amazon and have it delivered the next day for less than it would cost me to go to a shop and buy it?
gpt
Amazon consists of sellers who buy products at wholesale prices. Most of these sellers don't have physical stores so they save on business costs (rent, paying many workers etc) associated with running a store so they can afford to sell lower than physical stores. 

Even if they do have a store its always cheaper to buy online.