Socialism: Utopian and Scientific of thousands of copies. Throughout the decade of the 1860s, Karl Marx, close personal friend and political associate of Friedrich Engels, dedicated himself to the study of economics, culminating in the publication of the first volume of "Das Kapital" in 1867. Marx's lengthy and ponderous volume was extremely difficult for the average to penetrate, however, leading Engels to suggest to Marx in a letter of September 16, 1868 that a short popularized version of "Das Kapital" for a working class audience was urgently needed. "If it is not written, some Moses or other will come along and do it and
Thomas Kuczynski of his study of compensation claims for forced labour victims of the Nazi years (""Entschädigungsansprüche für Zwangsarbeit im ‚Dritten Reich‘ auf der Basis der damals erzielten zusätzlichen Einnahmen und Gewinne""). Kuczynski concluded that the German Federal Republic should pay victims of forced labour under Nazi Germany approximately 180 Billion Deutsche Marks. Later, in his book ""Brosamen vom Herrentisch"", he increased his estimate to 228 Billion Deutsche Marks (equivalent to €116 Billion). In 2007 Kuczynski took part in the theatre project, "Karl Marx: Das Kapital - Erster Band" (""Karl Marx: Das Kapital - First volume""), a show presenting a range of