'Che Conservative. 9 service above the cost actually incurred expressly for handling that particular item of traffic , is to be regarded as clear gain unless there is to be set against it revenue from traffic sacrificed in order to obtain it or a higher sum which , with greater ingenuity , might have been secured from this the service performed. This opinion , which is commonly re garded as a sound principle for the guidance of traffic and rate making officers , is , naturally , a great incentive toward the acceptance of low rates and the general encouragement and con stant creation and re-creation of mar ginal producers. The aim which it fos ters is the constant multiplication of tonnage and ton-mileage regardless , or nearly so , of the effect which such busi ness may have upon net revenues. The following extract fairly illustrates the traffic officer's attitude in this parti cular : "There is , of course , the underlying idea that our traffic does produce net earnings , but the certainty and amount of this profit on each kind of business are matter for inquiry at a different time and in a more thorough way. Therefore , the cry of the traffic depart ment for 'tonnage,1 regardless of kinder or distance hauled or amount of revenue , is not so mistaken. We cannot control the destination of single shipments , or regulate the length of the haul except in the case of alternative routing of through business. We can only take the business that is offered , be its haul great or small ; hence , the primary measure of the business we get is simply tons , irrespective of distance carried or class of freight. " Railways and Patrons. Briefly summarized , the relations be tween the railway and those of the patrons who supply distant markets with products subject to competition are the result of the following condi tious : 1. A definite price fixed by consum ers. 2. A definite marginal cost of pro duction at each producing point which each producer of form utilities must receive. 8. No definite cost of production of specific railway services , i. e.t place utili- ities. 4. Volume of traffic the principal measure of current success in adminis tration. f Under these conditions there can be no doubt as to which party will be found to bear the burden of whatever sacrifice in revenue may at any time be necessary. The producer of form utilities who does not receive his cost of production will go out of business and every sched ule of charges tends to create its mar ginal producer , hence there can be no advance in rates. There is usually an applicant for lower charges at every station who will guarantee increased volume of traffic if only he is enabled by lower charges , to place his goods or more of his goods in the market. Rail way officers are themselves watching iarefully for opportunities thus to in crease the traffic from their stations , to ) oint out new markets for the products of industries already established , and to encourage the inauguration of new forms of production in their territory. Such movements almost invariably re quire modifications in rate schedules and the changes are always downward. The slightest change in one shipping point must affect many others whinh produce for the common market , for the adjustment is always delicate and easily disturbed. If this analysis is accepted , the ques- ; iou naturally arises whether it is ap plicable to the traffic of a single line or of a single system. Will a railway sys tem enter separate combinations with shippers along its own lines and will these combinations compete among themselves , in a market not supplied from other sources , in such a way as ultimately to absorb the results of eco nomies in operation and to keep divi dends and interest at or below the cur rent commercial level ? Probably no such test is required in order to establish the accuracy of the theory herein pro posed as an explanation of facts which , as has been shownhave disclosed them selves in fragmentary form and in diverse aspects to numerous writers on transportation. Yet , without venturing the assertion that such competition will always exist in effective form among combinations to which a single line con tributes all of the complementary utili ties of place , it is believed that a few suggestions will indicate that it must control the charges of all but the least extensive lines. These will be found to be equally applicable to traffic origina ting in more widely separated regions and are merely supplemental to the con siderations already advanced. The constant fluctuations in indus trial conditions , which proceed from prosperity to depression with regular wave-like variations , must have cense queuces that are important in this con nection. The industries that are tribu tary to a single line will adjust them selves to its schedules and , as has been said , each shipping point will have its marginal producer. If the adjustment is regarded as that of a period of de pression , it is obvious that progress toward better times will entail increas ing demand , and the raising of the mar ginal cost of production. The former marginal producer will begin to receive a differential gain , and as the process goes on new marginal producers will ap pear , and in turn pass to the more for tunate class until the highest * point of business activity is reached. The rail way officer has seen traffic increase in volume and has possibly been able to in crease the"return to investors. The re action , however , finds an established volume of traffic and this must not be permitted to decrease , at least not with out a severe struggle to maintain the maximum. Prices at the ultimate market are declining , marginal cost of production at shipping points cannot be reduced without decreasing tonnage , clearly rates must decline with prices. Thus the process of declining rates con- ; inues , the adjustment of periods of de pression becomes that of periods of pros perity ; the latter cannot be maintained ; hrough the succeeding periods of de cline. Charges and Changed Conditions. With regard to some forms of pro duction , notably agriculture , the varia tions of successive seasons may be sub stituted for those of commercial condi tions with the same result. If it is ob jected that railway officers can adjust charges to improving conditions as well as to those of declining activity , the answer , from every student of railway history , will be that they never do. Only the most superficial will fail to see that they have no such incentive. To quote Mr. Eaton once more : "Very seldom is he ( the traffic man ager ) called upon for an explanation for increases of business. In some way the superior official assumes that on increase is per se a good showing. " As conditions of prosperity give place to those of depression , the barometer , volume of traffic , is frequently and earnestly scrutinized ; when the move ment is the other way , every one is too busy "moving the business" and ex changing congratulations over the good times to think of translating its indica tions in terms of earnings , much less of comparing these with problematical possibilities. It has already been suggested that the contention that the carrier mar protect its net earnings by refusing traffic at unprofitable rates is not groundless. In spite of the fact that it is often cheaper to carry business at a loss than not to carry it at all there is a limit , not to rates for specific services , but to general reductions which , at least in a progress ing country , will not permanently be passed. It is possibly too much to say that this limit is fixed by the sum nec essary to meet operating expenses and return to invested capital the current rate of interest and insurance against risks of similar hazard. There is evi dence , possibly not conclusive , yet suffi cient to suggest that the limit may be still lower. The attractive possibilities of gain through the manipulation of securities , of the realization of collater al profits through speculation in land contiguous to new lines ; the misleading hope of excessive gains growing out of examples furnished under the peculiar circumstances of some relatively early railway enterprises ; and the allure ments , formerly offered , in the way of Federal aid by means of grants of land