If the plane has empty seats, the cost of adding one more passenger is minuscule, although the average cost of flying a passenger is $500, the marginal cost is merely the cost of the bag of peanuts and can of soda that the extra passenger will consume.是什么意思_If the plane has empty seats, the cost of adding one more passenger is minuscule, although the average cost of flying a passenger is $500, the marginal cost is merely the cost of the bag of peanuts and can of soda that the extra passenger will consume.在线翻译_英语_读音_用法_例句