Every railroad manager has faced such a problem, and we may now concern ourselves with his methods of solving it. Suppose he is called on to fix a rate for some product which his road has never handled before, and, to connect up our present illustration with the preceding one, that it is offered in quantities sufficient to demand an entire train daily, which we will call the tenth train. Clearly, our manager would ordinarily not be willing to make the trainload rate lower than $300; nor would he dare to set it at a figure so high as to cause the shipper to abandon the project of shipping his goods. Here, then, are the extremes between which the manager may fix his rate; and we may well believe that he fixes it as near the upper limit as possible; that is, he charges all that the traffic mill bear.