system
Given the following post, respond as if you're commenting on Reddit:
human
How do two gas stations coexist on the same street if one always has lower prices.

There’s an intersection where I live where there’s a Shell and an Arco across from each other. Every time I’ve been there, the Arco has had lower prices than the Shell. How does the Shell station stay in business?
gpt
Because eventually one of them will hit their break-even and/or they would both hit their break-even. Gas stations don't make a ton of their money from the gas they sell, so break-even pricing on gas makes sense when there's downward price pressure. 

Also, typically the difference in pricing between gas stations on the same street isn't high enough and/or the lower priced gas doesn't have enough pumps to literally capture all the business of the other gas station.