our fleecings-system, only receives about one half [of the value of its production] as its share, it follows that the producers cannot buy back that which they create. * * * For the more Capital is being accumulated in private hands, the more impossible this wage-system renders it for the producers to buy what they produce. The more necessary it becomes for capitalists to dispose of their ever increasing fleecings, the less the ability of the people to purchase them will, relatively become. ... The more Capital, the more 'overproduction.' Individualism in production, although efficient in causing Capital to grow, was simultaneously "digging the grave of Capital", Gronlund declared. With Marx's Das Kapital still unavailable in English translation during the decade of the 1880s, Gronlund's reinterpretation of Marx into the American vernacular was revelatory, although he mentioned Marx's name "only once or twice in the book". More than 100,000 copies of The Cooperative Commonwealth were sold, and the book would remain one of the most influential works on the socialist theme in the United States for the rest of the 19th century. According to historian Rudolf Kirk, The Cooperative Commonwealth reflects Gronlund's distinctly Christian interpretation of Marx. Later writings After having lived in the United States for 20 years, in 1885 Gronlund made an extended stay to Great Britain, where he would remain for two years. Gronlund spent his time in Britain lecturing on socialist themes to both political and academic audiences, touching on both current politics and historical themes in speeches made across England and Scotland. Gronlund returned to his adopted country in 1887 and resumed his activism on behalf of the Socialist Labor Party. Gronlund was immediately called upon by the SLP to differentiate its views from the single tax program of Henry George, an 1886 candidate for mayor of New York City on the ticket of the upstart United Labor Party which the SLP had actively supported. The result of this assignment was two pamphlets, Socialism vs. Single Tax and Insufficiency of Henry George's Theory. The departure of the SLP from the broader United Labor Party of which it was a part was civil, with Gronlund remarking in a June 1887 lecture at New York City that Henry George was ... a most noble man, the starting wedge for socialism in the United States, but his theory is insufficient and his remedies would not accomplish what he