On my drive in to work yesterday, I noticed a gas station selling gas for $1.439 per gallon. A block away were two gas stations selling gas for $0.999 per gallon. (Both of these prices are self-serve, cheapest type of gas.) I don't understand the economics that let this discrepancy persist.
(The more expensive station was a Sunoco, but it's not a Sunoco thing; a Sunoco six blocks away charges $1.019.)