Supply decreases when prices can't go up, but need to. I saw this in my area of the U.S. a few years ago when severe weather events created issues with refiner

Supply decreases when prices can't go up, but need to. I saw this in my area of the U.S. a few years ago when severe weather events created issues with refineries for a few days, and it impacted gas deliveries to gas stations. It seemed like gas stations preferred to run out of gas at the pumps instead of raising the prices and be accused of gouging. Fortunately these were very temporary situations, and it seemed they've been mitigated now I think by temporarily removing limits on tanker truck driver hours when those situations occur.