Social Research Glossary
Citation reference: Harvey, L., 2012-17, Social Research Glossary, Quality Research International, http://www.qualityresearchinternational.com/socialresearch/
This is a dynamic glossary and the author would welcome any e-mail suggestions for additions or amendments. Page updated 2 January, 2017 , © Lee Harvey 2012–2017.
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Labour power is a person's ability to work (muscle-power, dexterity and brain-power), which under capitalism, is a commodity for sale.
In Marx's analysis of capitalism, labour power is a core concept that enables capitalist accumulation. Labour power means the capacity or ability to do work. It is the commodification of labour power that makes capitalist accumulation possible as in essence the capitalist purchases the labour power for less than the value of the product produced by the labour power and appropriates the difference. This is the basis of capitalist exploitation of workers.
Labour power exists in any kind of society but under capitalism, workers forfeit and control over their own labour, it is 'managed' by managers for the benefit of the capitalist owners of production.
There is a clear distinction in Marx's work between labour and labour-power. The former is the activity of producing goods or services; this is what Marx calls 'use value' Labour power is a person's ability to work, his or her muscle-power, dexterity and brain-power. Under capitalim, labour power becomes a commodity. As Marx states:
Their commodity, labour-power, the workers exchange for the commodity of the capitalist, for money, and, moreover, this exchange takes place at a certain ratio. So much money for so long a use of labour-power. For 12 hours' weaving, two shillings. And these two shillings, do they not represent all the other commodities which I can buy for two shillings? Therefore, actually, the worker has exchanged his commodity, labour-power, for commodities of all kinds, and, moreover, at a certain ratio. By giving him two shillings, the capitalist has given him so much meat, so much clothing, so much wood, light, etc., in exchange for his day's work. The two shillings therefore express the relation in which labour-power is exchanged for other commodities, the exchange-value of labour-power.
The exchange value of a commodity estimated in money is called its price. Wages therefore are only a special name for the price of labour-power, and are usually called the price of labour; it is the special name for the price of this peculiar commodity, which has no other repository than human flesh and blood." (Marx, 1867, Ch 2)
In Capital (Marx 1867) Volume 1 Chapter Six: 'The Buying and Selling of Labour-Power': Marx initially introduced the notion of labour power and explained how it comes into being as a commodity in capitalism.
By labour-power or capacity for labour is to be understood the aggregate of those mental and physical capabilities existing in a human being, which he exercises whenever he produces a use-value of any description.
But in order that our owner of money may be able to find labour-power offered for sale as a commodity, various conditions must first be fulfilled. The exchange of commodities of itself implies no other relations of dependence than those which, result from its own nature. On this assumption, labour-power can appear upon the market as a commodity, only if, and so far as, its possessor, the individual whose labour-power it is, offers it for sale, or sells it, as a commodity. In order that he may be able to do this, he must have it at his disposal, must be the untrammelled owner of his capacity for labour, i.e., of his person.  He and the owner of money meet in the market, and deal with each other as on the basis of equal rights, with this difference alone, that one is buyer, the other seller; both, therefore, equal in the eyes of the law. The continuance of this relation demands that the owner of the labour-power should sell it only for a definite period, for if he were to sell it rump and stump, once for all, he would be selling himself, converting himself from a free man into a slave, from an owner of a commodity into a commodity. He must constantly look upon his labour-power as his own property, his own commodity, and this he can only do by placing it at the disposal of the buyer temporarily, for a definite period of time. By this means alone can he avoid renouncing his rights of ownership over it. 
The second essential condition to the owner of money finding labour-power in the market as a commodity is this — that the labourer instead of being in the position to sell commodities in which his labour is incorporated, must be obliged to offer for sale as a commodity that very labour-power, which exists only in his living self.
In order that a man may be able to sell commodities other than labour-power, he must of course have the means of production, as raw material, implements, &c. No boots can be made without leather. He requires also the means of subsistence. Nobody — not even “a musician of the future” — can live upon future products, or upon use-values in an unfinished state; and ever since the first moment of his appearance on the world’s stage, man always has been, and must still be a consumer, both before and while he is producing. In a society where all products assume the form of commodities, these commodities must be sold after they have been produced, it is only after their sale that they can serve in satisfying the requirements of their producer. The time necessary for their sale is superadded to that necessary for their production.
For the conversion of his money into capital, therefore, the owner of money must meet in the market with the free labourer, free in the double sense, that as a free man he can dispose of his labour-power as his own commodity, and that on the other hand he has no other commodity for sale, is short of everything necessary for the realisation of his labour-power.
The question why this free labourer confronts him in the market, has no interest for the owner of money, who regards the labour-market as a branch of the general market for commodities. And for the present it interests us just as little. We cling to the fact theoretically, as he does practically. One thing, however, is clear — Nature does not produce on the one side owners of money or commodities, and on the other men possessing nothing but their own labour-power. This relation has no natural basis, neither is its social basis one that is common to all historical periods. It is clearly the result of a past historical development, the product of many economic revolutions, of the extinction of a whole series of older forms of social production.
copyright Lee Harvey 2012–2017
copyright Lee Harvey 2012–2017