Theories of Surplus Value (German: Theorien über den Mehrwert) is a draft manuscript written by Karl Marx between January 1862 and July 1863.
[1] It is mainly concerned with the Western European theorizing about Mehrwert (added value or surplus value) from about 1750, critically examining the ideas of British, French and German political economists about wealth creation and the profitability of industries.
The total 1861–1863 manuscript consists of 23 notebooks (the pages numbered consecutively from 1 to 1472) running to some 200 printed sheets in length.
Theories of Surplus Value forms the longest (about 110 printed sheets) and most fully elaborated part of this huge manuscript, and it is the first and only draft of the fourth, concluding volume of Das Kapital.
[6] Marx began to write Theories of Surplus Value within the framework of the original plan of his Critique of Political Economy as he had projected in 1858–1862.