because his labor does not yet exist. He cannot sell a thing that has no existence. When his labor comes into real objective existence, it is incorporated with materials that are the property of the class that rules him, and no longer belongs to him. He cannot sell what he don't possess. There is only one thing he can sell, namely, his mental and physical or muscular power to do things, to make things. He can sell this for a definite time to an employer, just exactly as a livery stable keeper sells a horse's power to trot to his customers for so much per hour. Now this power of his to do things is what we call his labor-power; that is, his capacity to perform work. Now, its value is determined precisely like the value of every other commodity, i. e., by the labor-time socially necessary for its production. Now the labor-time socially necessary for the production of labor-power is the labor-time socially necessary to produce the food, clothing and shelter or lodging that are necessary to enable the laborer to come on the labor market day after day able physically to work, and also to enable him to beget and raise children who will take his place as wage-slaves when he shall have been buried
