http://www.marxists.org/archive/marx/works/1847/wage-labour/ch05.htm
In the process of production, human beings work not only upon nature, but also upon one another. They produce only by working together in a specified manner and reciprocally exchanging their activities. In order to produce, they enter into definite connections and relations to one another, and only within these social connections and relations does their influence upon nature operate – i.e., does production take place.
These social relations between the producers, and the conditions under which they exchange their activities and share in the total act of production, will naturally vary according to the character of the means of production. With the discover of a new instrument of warfare, the firearm, the whole internal organization of the army was necessarily altered, the relations within which individuals compose an army and can work as an army were transformed, and the relation of different armies to another was likewise changed.
We thus see that the social relations within which individuals produce, the social relations of production, are altered, transformed, with the change and development of the material means of production, of the forces of production. The relations of production in their totality constitute what is called the social relations, society, and, moreover, a society at a definite stage of historical development, a society with peculiar, distinctive characteristics. Ancient society, feudal society, bourgeois (or capitalist) society, are such totalities of relations of production, each of which denotes a particular stage of development in the history of mankind.
Capital also is a social relation of production. It is a bourgeois relation of production, a relation of production of bourgeois society. The means of subsistence, the instruments of labour, the raw materials, of which capital consists – have they not been produced and accumulated under given social conditions, within definite special relations? Are they not employed for new production, under given special conditions, within definite social relations? And does not just the definite social character stamp the products which serve for new production as capital?
Capital consists not only of means of subsistence, instruments of labour, and raw materials, not only as material products; it consists just as much of exchange values. All products of which it consists are commodities. Capital, consequently, is not only a sum of material products, it is a sum of commodities, of exchange values, of social magnitudes. Capital remains the same whether we put cotton in the place of wool, rice in the place of wheat, steamships in the place of railroads, provided only that the cotton, the rice, the steamships – the body of capital – have the same exchange value, the same price, as the wool, the wheat, the railroads, in which it was previously embodied. The bodily form of capital may transform itself continually, while capital does not suffer the least alteration.
Lib-com also has a good page on this written in more contemporary language:
http://libcom.org/library/capitalism-introduction
libcom.org's brief introduction to capitalism and how it works.
At its root, capitalism is an economic system based on three things: wage labour (working for a wage), private ownership of the means of production (things like factories, machinery, farms, and offices), and production for exchange and profit.
While some people own means of production, or capital, most of us don't and so to survive we need to sell our ability to work in return for a wage, or else scrape by on benefits. This first group of people is the capitalist class or "bourgeoisie" in Marxist jargon, and the second group is the working class or "proletariat". See our introduction to class here for more information on class.
Capitalism is based on a simple process – money is invested to generate more money. When money functions like this, it functions as capital. For instance, when a company uses its profits to hire more staff or open new premises, and so make more profit, the money here is functioning as capital. As capital increases (or the economy expands), this is called 'capital accumulation', and it's the driving force of the economy.
Those accumulating capital do so better when they can shift costs onto others. If companies can cut costs by not protecting the environment, or by paying sweatshop wages, they will. So catastrophic climate change and widespread poverty are signs of the normal functioning of the system. Furthermore, for money to make more money, more and more things have to be exchangeable for money. Thus the tendency is for everything from everyday items to DNA sequences to carbon dioxide emissions – and, crucially, our ability to work - to become commodified.
And it is this last point - the commodification of our creative and productive capacities, our ability to work - which holds the secret to capital accumulation. Money does not turn into more money by magic, but by the work we do every day.
In a world where everything is for sale, we all need something to sell in order to buy the things we need. Those of us with nothing to sell except our ability to work have to sell this ability to those who own the factories, offices, etc. And of course, the things we produce at work aren't ours, they belong to our bosses.
Furthermore, because of long hours, productivity improvements etc, we produce much more than necessary to keep us going as workers. The wages we get roughly match the cost of the products necessary to keep us alive and able to work each day (which is why, at the end of each month, our bank balance rarely looks that different to the month before). The difference between the wages we are paid and the value we create is how capital is accumulated, or profit is made.
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