Das Kapital sciences published before 1950. In "Das Kapital" (1867), Marx proposes that the motivating force of capitalism is in the exploitation of labor, whose unpaid work is the ultimate source of surplus value. The owner of the means of production is able to claim the right to this surplus value because he or she is legally protected by the ruling regime through property rights and the legally established distribution of shares which are by law only to be distributed to company owners and their board members. The historical section shows how these rights were acquired in the first place chiefly through
Karl Marx Library effort," Jordan presciently predicted. The first volume of the series, "On Revolution" (1971) broke little original ground for Marx scholars, containing only a spate of articles from the 1850s from Horace Greeley's "New York Tribune" on the contemporary situation in Spain that were not already readily available in other publications. Padover's failure to maintain a chronological presentation of documents was criticized by one reviewer, who observed that Marx's own views on the nature and time span of the revolutionary process evolved considerably during the second half of the 1800s. Padover's lengthy introduction to the first volume, "Karl Marx as Revolutionist,"