COMPARATIVE ADVANTAGE AND PROTECTION 193 tection. The woolen industry, on the other hand, nearly as old, has continued to need the prop of tariff support; and this to an extent not easy to explain satisfactorily. The manufacture of silks, the youngest of all, has grown with extraordinary speed to great dimensions, and has progressed toward independence in the degree to which its raw material has been made homogeneous and its products amenable to the machine. However different their degree of dependence on protection, each of the textile industries presents within its own limits differences and apparent anomalies analogous to those noted in agriculture and the iron trade. Most of the standard cottons, for example, are made to advantage within the country; but some finer goods and specialties continue to be imported. While most woolen goods need protection, some need protection more than others. Large groups of silk fabrics seem to be independent of protection; but other large groups have by no means reached that stage, and still others are imported in face of high duties. Everywhere we find within the same industry some branches that possess greater advantages than others, or less disadvantages. The line of cleavage between those textiles that are made to advantage in the United States or with no great disadvantage, and those that labor under so great a disadvantage that they continue to be imported notwithstanding high duties, is most often that between cheaper and medium goods on the one hand, finer and more expensive articles on the other. When it is asked why this pervading difference, the answer commonly given is that the finer goods must be more carefully finished and call for more labor; therefore high wages are a peculiarly strong obstacle to their pro- duction in the United States. Where machinery can be much used, as with the cheaper goods (such as are made and sold in great quantities), the American producers can more easily hold their own without protection; the explanation, it is said, being that less of the expensive labor is involved and more use is made of machinery. But it requires no great economic insight to see that this only pushes the question back a step. Why is not the machinery itself more expensive? The machinery was made by labor. It is a