If railroads charged all customers the same average rate, they argue, shippers who have the option of switching to trucks or other forms of transportation would do so, leaving remaining customers to shoulder the cost of keeping up the line.如果他们对于每个客户都收取同样的平均费用,那么那些有选择的客户就可能会离开,结果让剩下的客户承担所有维持运输线路的费用。
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