5. Monopoly is such a degree of control over the supply of goods in a given market that a net gain will result to the seller if a portion is withheld. Every producer has control over some agents and some portion of the supply of products; but ordinarily the portion controlled by any one is so small that withholding it entirely from sale would not cause the market price to rise in any appreciable degree. The producer in such a case regulates his action as if the market price were fixed beyond his control, and he uses his productive agents fully up to the point where costs equal price on the marginal unit of product. A skilled worker getting five dollars a day loses that sum every day he is idle. A landowner whose land can command a competitive rent of ten dollars an acre must take that sum or less, or nothing; he cannot get more. How can a net gain ever result from a smaller sale? As a reduction of supply results in a higher price, it is possible, as is seen in the paradox of value, for a situation to arise in the case of some goods, where a smaller number of units yield a larger sum in the market than a larger number of units. But the seller's interest lies not in the increase of total sales, but in that of net gains. Net gains, being the product of the number of units sold multiplied by the gain on each unit, increase at a much faster rate than do total sales. The existence of monopoly power in any degree depends therefore on several factors: the effect of contraction of supply in raising prices, the effect on costs, the number of units remaining in the ownership of the one contracting supply, and the possibility of preventing others from increasing supply later to profit by the higher prices.
§ II. KINDS OF MONOPOLY
The sources of monopoly power
Political monopoly
1. Monopoly gets its power from political, economic, and commercial sources. A political monopoly derives its power of control from a special grant from the government, forbidding others to engage in that business. The typical political monopoly is that conferred by a crown patent bestowing the exclusive right to carry on a certain business. A second kind is that conferred by a patent for invention, or the copyright on books, the object of which is to stimulate invention, research, and writing by giving the full control and protection of the government to the inventor and writer or their assignees. In this case the privilege is socially earned by the monopolist; it is not gotten for nothing. Moreover, the patent is limited in time, expires and becomes a social possession. A third kind is a government monopoly for purposes of revenue. In France, the government controls the tobacco trade, and the high price charged for tobacco makes the monopoly yield a large income. A fourth kind are public franchises for public service, as street-railways, lights, gas, waterworks, etc. These are granted to private capitalists to induce them to invest capital in something which has public utility.
Economic monopoly
Economic monopoly arises when the ownership of scarce natural agents, as mines, land, water-power, comes under the control of one man or one group of men who agree on a price. Economic monopoly is a result of private property that is undesigned by the government or by society. It is exceptional, considering the whole range of private property, but it is important. The oil-wells embracing the main sources of the world's supply have come under one control. One corporation may control so many of the richest iron-mines of the country as to be able to fix a price different from that which would result under competition. Coal-mines, especially those of some peculiar and limited kind, such as anthracite, appear to become easily an object of monopolization. Economic monopoly merges into political monopolies, such as patents and franchises. Private property is a political institution designed to further social welfare, and only rarely is any particular property a monopoly. Private control of great natural resources doubtless would have been prohibited had it been foreseen.
Commercial monopoly
Commercial monopoly, variously called contractual, organized, or capitalistic monopoly, arises where men unite their wealth to control a market, to overpower or intimidate opposition, and to keep out or limit competition by the mere magnitude of their wealth. These various kinds so merge into each other that they cannot always be distinguished in practice. A patent may help a capitalistic monopoly in getting control of a market; great wealth may enable a company to get control of rare natural resources.