The complete realisation of exchange values or the social labour that is performed depends, as is seen, on the adaptation of supply to demand, and is a matter of organisation, of social direction.
We have noticed that the Marxian theory of value is related to that of the classical economists, but they are by no means the same thing. Apart from some improvements and definitions which Marx made, they are distinguished by the following conceptions: In the classical theory of value, the capitalist who directs production and provides with his capital the tools and raw materials of labour, markets the finished commodity, and keeps going the processes of reproduction, appears as the only creator of value: the wage worker is only one of his means of production. In the Marxian theory of value, on the other hand, the wage worker who transforms the raw materials into commodities, or removes the raw materials to the place of production, appears as the sole creator of value. Value is only created by the worker in production, and in distribution connected therewith.
3. Wages and Labour.
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.
The employer can make use of labour power so long that it not only creates its own exchange value (the value of the means of subsistence), but double this. To create the value of wages, the worker needs five or six hours daily, but he is obliged to produce for the capitalist during ten or twelve hours. If the worker were independent he would only produce during one half of the working day in order to receive his means of subsistence. This period of producing Marx called "necessary labour." As he is dependent on the capitalist, the worker must not only perform "necessary labour" but also surplus labour: the worker can generally only find employment under the conditions that, besides the time needed for himself, he also works a definite number of hours for the capitalist without payment. Or, as Marx says: "The fact that half a day's labour is necessary to keep the labourer alive during the 24 hours, does not in any way prevent him from working the whole day. Therefore, the value of labour power and the value which labour creates in the labour process are two entirely different magnitudes. And this difference in the two values was what the capitalist had in view when he was purchasing labour power. The circumstance that on the one hand the daily sustenance of labour power costs only half a day's labour, while on the other hand the very same labour power can work during a whole day; that consequently the value which its use during one day creates is double what he pays for that use, this circumstance is, without doubt, a piece of good luck for the buyer, but by no means an injury to the seller."
"No injury to the seller," which is quite correct from the standpoint of Ricardo, but not from that of Marx. He often calls surplus value "unpaid labour," and says, for example, "the capitalist appropriates one half of every day's labour without payment." In other words, he takes away something without return. This is a very distinct ethical judgment.