Writes a book called "das kapital" https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Zentralbibliothek_Zürich_Das_Kapital_Marx_1867.jpg/170px-Zentralbibliothek_Zürich_Das_Kapital_Marx_1867.jpg Spent most of his life living off the generosity of his collaborator and patron Engels, who inherited his money from his father