Money is the alienated essence of man's labour and life; and this alien essence dominates him as he worships it. From the concepts of commodities and money, surplus-value of labour, the accumulation of capital, and its process of circulation, to the conversion of surplus value into profit and transformation of surplus-profit into ground rent, Karl Marx's Capital presents his theory of the capitalist system. Regarded as a significant work of the modern economic thought, this magnum opus is a comprehensive critique on the political economy. This edition contains all the three volumes of the Capital. Out of the three, only the first volume was published by Marx during his lifetime. The remaining two were prepared by Friedrich Engels using Marx's notes.