2. At a busy intersection, there are four gas stations - one on each corner. Each of the gas stations always charges the same price as the others (that price goes up and down as changes in supply and demand warrant, but each station always charges the same price as the others charge). Does this sameness in pricing indicate that the gas stations have formed a cartel, or is there some other - more likely - explanation for why all of these gas stations charge the same price? Explain your answer.