Gas price is essentially a reflection of crude oil price. (There are some other factors, but the price of c[rude is the single most important](https://media.bespokepremium.com/uploads/2020/04/042020-Gas-vs-Oil-Prices.png))
Crude oil is a commodity. It is bought and sold, is traded in the commodities and futures markets, and as such its price fluctuates daily. Or hourly. Or by the minute
It would no more have a set price than literally anything else. Prices always change
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