“We have just seen that, apart from money-capital, circulating capital is only another name for commodity-capital. But to the extent that labour power circulates in the market, it is not capital, no form of commodity-capital. It is not capital at all; the labourer is not a capitalist, although he brings a commodity to market, namely his own skin.”

“The circulation of capital realizes value, while living labour creates value.”

Karl Marx (1818–1883) German philosopher, economist, sociologist, journalist and revolutionary socialist

“His capital is continually going from him in one shape, and returning to him in another, and it is only by means of such circulation, or successive exchanges, that it can yield him any profit. Such capitals, therefore, may very properly be called circulating capitals.”

Adam Smith (1723–1790) Scottish moral philosopher and political economist

“The geographical movement of money and commodities as capital is not the same as the movements of products and of precious metals. Capital is, after all, money used in a certain way, and is by no means identical with all money uses.”

David Harvey (1935) British anthropologist

“Capital is money, capital is commodities. … By virtue of it being value, it has acquired the occult ability to add value to itself. It brings forth living offspring, or, at the least, lays golden eggs.”

Karl Marx (1818–1883) German philosopher, economist, sociologist, journalist and revolutionary socialist

“A class of labourers, who live only so long as they find work, and who find work only so long as their labour increase capital. These labourers, who must sell themselves piecemeal, are a commodity, like every other article of commerce, and are consequently exposed to all the vicissitudes of competition, to all the fluctuations of the market.”

Karl Marx (1818–1883) German philosopher, economist, sociologist, journalist and revolutionary socialist

“No fixed capital can yield any revenue but by means of a circulating capital.”

Adam Smith (1723–1790) Scottish moral philosopher and political economist

“Capitalism is commodity production at the highest stage of development, when labor power itself becomes a commodity. The growth of internal exchange, and particularly of international exchange, is a special feature of capitalism. The uneven and spasmodic character of the development of individual enterprises, of individual branches of industry and individual countries, is inevitable under the capitalist system.”

Vladimir Lenin (1870–1924) Russian politician, led the October Revolution

“I think it is only because capitalism has proved so enormously more efficient than alternative methods that it has survived at all. (…) I'm not sure capitalism is the right word. There is a sense in which every society is capitalist. The Soviet Union was capitalist, but it was state capitalism. Latin American societies in the past have been capitalist, but it has been oligarchic capitalism. So what we really need to talk about is not capitalism but free market or competitive capitalism which is the system that we would like to have adopted, not just capitalism.”

Milton Friedman (1912–2006) American economist, statistician, and writer

“In reality, the labourer belongs to capital before he has sold himself to capital.”

Karl Marx (1818–1883) German philosopher, economist, sociologist, journalist and revolutionary socialist