Theorien über den Mehrwert
"Theories of Surplus Value" was originally conceived by Marx only as a historical excursion in the section of his theoretical study of "capital in general". This was to conclude the section on the process of production of capital. This ambitious plan proved to be more than Marx could undertake as he was effectively burned out before he had completed the study of capital. Even the publication of "Theories of Surplus Value" did not make all of Marx's writing on political economy available to the public and this task was only fulfilled decades later with the publication of the "Grundrisse", the "Results of the Immediate Production Process" and various other manuscripts.