the amount of advantage which is held over existing or possible competitors.* When the advantage of the monopoly is so great that no other competitor will try to do business in competition with it, we may rightly say that competition is dead. The great share of the monopolies which are based on this seventh law of competition, those due to the control of natural agents, only restrict competition by the attainment of an advantage over their competitors, and do not destroy it.
The principal natural agents which are necessary to production, and whose supply may be so limited to cause an appreciable monopoly, are: (1) Land for agricultural purposes; (2) land for purposes of manufacture or commerce; (3) transportation routes, such as mountain passes, room for railway tracks in a city street, or for gas-and water-pipes beneath its surface; (4) natural deposits of minerals and metals; (5) sources of water supply or water power. (The latter is unimportant now compared with a score of years ago, because of the lessened cost of its competitor, steam.)
Let us be especially careful not to confound this seventh law of competition with a certain doctrine which is now receiving more and more credence, which is, in brief, that