If, on the other hand, the restrictive tariff invites capital from abroad for the sake of gaining the trade of a country, the diminished profit of labor in some foreign country compels emigration, and such emigrants are likely to follow the capital. Only the poorest of foreign laborers will be compelled to help themselves by emigration, and only those will gain by the change of location. Thus it is said a restrictive tariff encourages the least desirable form of immigration. This is illustrated in the development of the mining industry through the fostering effects of the tariff. There can be no question that any restriction upon trade may foster the contrivance of combination to secure monopoly. Hence it is often claimed that the existence of trusts is due in great measure to tariff restrictions, preventing the competition natural in the commercial world. It is certainly true that the restriction of a patent right may make possible the abuses of a trust. If trusts were confined to protected industries or to countries maintaining protective systems, the weight of the argument would be stronger. It is certainly true, however, that the wider the range of competition without restriction, the greater the protection against combination for sake of monopoly. The monopoly in kerosene oil would be a greater menace but for the possible check of competition from abroad. Such artificial restrictions, again, prevent the naturally rapid growth of international commerce, which gives the surest foundation for more permanent conditions of peace and greater extension of welfare over the world. The tremendous interests of the commercial world are the strongest safeguard against unnecessary warfare, and the best protection to any nation is the fact that it makes itself needed by all the rest of the world. Thus inter-dependence of nations rather than independence is the essential aim of those who seek the world’s welfare. An alliance of two peoples for commercial purposes is the best guaranty of mutual support of national institutions.