The worker appears to receive wages for his work. In reality he receives wages as the equivalent for the labour power expended by him, quite in accordance with the law of value, inasmuch as he receives by way of exchange as much means of sustenance as is usual and customary to replace the labour power he has expended, just as the working horse receives as much oats and hay as are necessary to maintain it capable of work. The capitalist and the worker exchange certain quantities of commodities in proportions determined by economic laws (means of subsistence against a quantity of the commodity, labour power, of equal value, commodity for commodity, exchange value for exchange value). As, therefore, the wages of labour signify a certain quantity of the means of subsistence, so they increase even if their money form remains unaltered with a fall in the price of the means of life, for the worker is then in the position, with his unaltered wage, to buy a greater quantity of the means of life. In the reverse case, if the prices of the means of life rise, the wages of labour fall, even if their money form remains the same as previously. This law of wages, formulated by Ricardo, was accepted by Marx, but he did not content himself with this acceptance. Ricardo regarded the capitalist world as the only possible and reasonable one, at least at the time when he wrote his "Principles," while Marx from the year 1843 adopted a critical attitude towards it, and sought to negate it. Consequently, he investigated further, and expressed himself somewhat as follows: The capitalist theoricians believed that the wages question was disposed of when it was settled by the law of value. We know, however, that every commodity possesses not only an exchange value, but also a use value, and is bought for the sake of the latter. The use value of the commodity labour power is distinguished in a very remarkable way from the use value of all other commodities. The use or the employment of labour power creates exchange value, and can create much more exchange value than itself possesses.