Uh...charging whatever the market will bear is supply and demand.
Well if that's what it is, then that's what it is.
Still, charging whatever the market will bear regardless of any actual shortage or surplus, is something that a monopoly in collusion with other monopolies is better able to get away with doing.
That's something different than saying prices are high simply because supplies are tight.
Prices are high because they can get away with it, because for many buying gas is not a choice.
You either buy it, or give up on earning a living.
It's past my bedtime.
Maybe I'll feel more like debating what is and isn't supply & demand tomorrow, or maybe not.