But labor cannot reap the benefits which advancing civilization thus brings, because they are intercepted. Land being necessary to labor, and being reduced to private ownership, every increase in the productive power of labor but increases rent—the price that labor must pay for the opportunity to utilize its powers; and thus all the advantages gained by the march of progress go to the owners of land, and wages do not increase. Wages cannot increase; for the greater the earnings of labor the greater the price that labor must pay out of its earnings for the opportunity to make any earnings at all. The mere laborer has thus no more interest in the general advance of productive power than the Cuban slave has in advance in the price of sugar. And just as an advance in the price of sugar may make the condition of the slave worse, by inducing the master to drive him harder, so may the condition of the free laborer be positively, as well as relatively, changed for the worse by the increase in the productive power of his labor. For, begotten of the continuous advance of rents, arises a speculative tendency which discounts the effect of future improvements by a still further advance of rent, and thus tends, where this has not occurred from the normal advance of rent, to drive wages down to the slave point—the point at which the laborer can just live. And thus robbed of all the benefits of the increase in productive power, labor is exposed to certain effects of advancing civilization which, without the advantages that naturally accompany them, are positive evils, and of themselves tend to reduce the free laborer to the helpless and degraded condition of the slave. For all improvements which add to productive power as civilization advances consist in, or necessitate, a still further subdivision of labor, and the efficiency of the whole body of laborers is increased at the expense of the independence of the constituents. The individual laborer acquires knowledge of and skill in but an infinitesimal part of the varied processes which are required to supply even the commonest wants. The aggregate produce of the labor of a savage tribe is small, but each member is capable of an independent life. He can build his own habitation, hew out or stitch together his own canoe, make his own clothing, manufacture his own weapons, snares, tools and ornaments. He has all the knowledge of nature possessed by his tribe—knows what vegetable productions are fit for food, and where they may be found; knows the habits and resorts of beasts, birds, fishes, and insects; can pilot himself by the sun or the stars, by the turning of blossoms or the mosses on the trees; is, in short, capable of supplying all his wants. He may be cut off from his fellows and still live; and thus possesses an independent power which makes him a free contracting party in his relations to the community of which he is a member.