system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do gas stations constantly adjust their prices up and down with the market, but retailers of other commodity-driven products (coffee shops, jewelers, etc.) don't?
gpt
Because they can.

For a gas station with electronic signage, there is almost no upfront cost in changing the price that gas is being sold at.    Unlike many commodities where physical paper signs must be changed (where the cost of labor discourages frequent small changes.).

Gas is a commodity with an inflexible demand.  If you need gas on a particular day, there's not much you can do except buy gas from someone, which leads to

Competition between nearby gas stations.  Many major gas stations are in close proximity to another.    As the product they sell is virtually the same thing, a price war often ensues: with each gas station trying to win over customers, while avoiding hurting their profit margin too much.    

Also, because of near-daily price adjustments over the past few years, customers have come to expect in accept it.   A coffee shop or a grocery store would likely draw intense feedback if they started adjusting prices frequently.