The laborer’s use value is the ability to produce commodities, and in return the laborer is provided with a fair exchange value, or wage, which meets his basic costs of living. Yet when the laborer’s use value is combined with the machines owned by the employer, the commodities produced are worth more than the laborer’s exchange value; in this way a surplus is generated, which the employer takes as profit—this, Marx argued, is “exploitation.” Such profit then provides the means by which capitalism can grow and expand, powered by the continual expansion of exploitation.