A notable illustration of such confusion is the volume by Dr. F. C. Howe, entitled, "Privilege and Democracy in America." He maintains that bituminous coal, copper ore, and natural gas are true monopolies, but gives no adequate proof to support this assertion. Moreover, he exaggerates considerably the part played by landownership in the formation of industrial monopolies. Thus, his contention that the petroleum monopoly is due to ownership of oil-producing lands is certainly incorrect; for the Standard Oil Company (or companies) has never controlled as much as half the supply of raw material. "The power of the Standard does not rest upon a direct monopoly of the production of crude oil through ownership of the wells."[49] Perhaps the most remarkable misstatement in the volume is this: "The railway is a monopoly because of its identity with land."[50] Now there are a few important railway lines traversing routes or possessing terminal sites which are so much better than any alternative routes or sites as to give all the advantages of a true monopoly. But they are in a small minority. In the great majority of cases, a second parallel strip or parallel site could be found which would be equally or almost equally suitable. Neither the amount nor the kind of land owned by a railroad, nor its legal privilege of holding land in a long, continuous strip, is the efficient cause of a railway monopoly. To attribute the monopoly to land is to confound a condition with a cause. One might as well say that the land underlying the "wheat king's" office is the cause of his corner in wheat. It is true that in a few of the great cities the existing railroads may, through their ownership of all the suitable terminal sites, prevent the entrance of a competing line. In the first place, such instances are rare; in the second place, the fact that there are several roads already in existence shows that competition was possible without the entrance of another one. The influence impelling them to form a monopoly for the regulation of charges is not their ownership of terminal sites. No sort of uniform action with regard to terminals would produce any such effect. The true source of the monopoly element in railways is inherent in the industry itself. It is the fact of "increasing returns," which means that each additional increment of business is more profitable than the preceding one, and that in most cases this process can be kept up indefinitely. As a consequence, each of two or more railroads between two points strives to get all the traffic; then follows unprofitable rate cutting, and finally combination.[51] The same forces would produce identical results if railroad tracks and terminals were suspended in the air.