The machine cannot run without lubricant and the worker cannot work and reproduce himself without being fed, clothed and housed; this is his lubricant and the amount he requires to keep him in running order regulates his wage. Karl Marx, in his “Wage, Labor and Capital,” makes these points clear in his own terse and masterly style. We quote as follows: “The free laborer sells himself, and that by fractions. From day to day he sells by auction, eight, ten, twelve, fifteen hours of his life to the highest bidder—to the owner of the raw material, the instruments of work and the means of life; that is, to the employer. The laborer himself belongs neither to an owner nor to the soil; but eight, ten, twelve, fifteen hours of his daily life belong to the man who buys them. The laborer leaves the employer to whom he has hired himself whenever he pleases; and the employer discharges him whenever he thinks fit; either as soon as he ceases to make a profit out of him or fails to get as high a profit as he requires. But the laborer whose only source of earning is the sale of his labor power cannot leave _the whole class of its purchasers_, that is the capitalist class, without renouncing his own existence. He does not belong to this or that particular employer, but he does belong to the _capitalist class_; and more than that: it is his business to find an employer; that is, among this capitalist class it is his business to discover _his own particular purchaser_.” Coming to the matter of wages and how they are determined, Marx continues: “Wages are the price of a certain commodity, labor-power. Wages are thus determined by the same law which regulates the price of any other commodity. “Thereupon the question arises, how is the price of a commodity determined? “By means of competition between buyers and sellers and the relations between supply and demand—offer and desire. “* * * Now the same general laws which universally regulate the price of commodities, regulate, of course, _wages, the price of labor_. “Wages will rise and fall in accordance with the proportion between demand and supply; that is, in accordance with the conditions of the competition between capitalists as buyers and laborers as sellers of labor. The fluctuations of wages correspond in general with the fluctuation in the price of commodities. _Within these fluctuations the price of labor is regulated by its cost of production; that is, by the duration of labor which is required in order to produce this commodity, labor power._ _“Now what is the cost of production of labor power?_ _“It is the cost required for the production of a laborer and for his maintenance as a laborer._ _“* * * The price of his labor is therefore determined by the price of the bare necessaries of his existence._”