I hit submit too quickly.
So here’s the way I look at this, and why I still think that there’s a type of collusion in play. I’m going to be using hypothetical numbers for illustrative purposes. When gas was $2.00 a gallon at the pump for a reasonably long period, let’s just say that after all costs, the average gas seller was netting $0.20 profit per gallon. This was achieved by paying $1.50 per gallon wholesale for oil and $0.30 for fixed costs, variable costs and overhead.
At this point, in a competitive marketplace, it would have been impossible to raise the price of gas without losing customers (and sales volume). When the wholesale cost increased to $2.30 (due to the higher price of the natural resource), the new “natural” price at the pump should have been $2.80. This would have yielded the same profit of $0.20 per gallon. But since customers were now forced to pay more at the pump, and since they really don’t have a way of distinguishing between the resource costs and the operating costs, it was an opportune time for the gas seller to bump up it’s profit by charging $3.00 at the pump. But the problem was that every gas seller had to do the same, or it just wouldn’t work.
So, a few sellers started posting a $3.00 price, while some others stuck to the “natural” $2.80. At this point, the $3.00 sellers should have dropped back down to $2.80 in order to compete. But they held their ground, knowing that the $2.80 sellers would soon join them at the higher price. This is collusion.