History of economic thought died, Engels completed the second volume of "Das Kapital" from his notes. Marx wrote his magnum opus "Das Kapital" (1867) at the British Museum's library in London. Karl Marx begins with the concept of commodities. Before capitalism, says Marx, production was based on slavery – in ancient Rome for example – then serfdom in the feudal societies of medieval Europe. The current mode of labor exchange has produced an erratic and unstable situation allowing the conditions for revolution. People buy and sell their labor as people buy and sell goods and services. People themselves have become disposable commodities. As Marx
Circle of Tchaikovsky tasks of the Tchaikovtsy was to organize the printing, publishing, and distribution of scientific and revolutionary literature with the help of publishers Nikolai Polyakov, Kozma Soldatyonkov, and others. These literary works included the first volume of "Das Kapital" by Karl Marx, and books by others including Nikolai Chernyshevsky, Nikolai Dobrolyubov, Alexander Herzen, Pyotr Lavrov, Vasili Bervi, Ferdinand Lassalle, Charles Darwin, and John Stuart Mill. In the summer of 1871, the circle of Natanson merged with a female self-education circle of Alexandra Kornilova and Sophia Perovskaya. Soon, they were joined by Peter Kropotkin, Sergei Stepnyak-Kravchinsky, Dmitry Klements, Sergei Sinegub, Nikolai Charushin,