Harpo Marx several minutes about his career, and how he would miss it all, and repeatedly interrupted Sherman when he tried to speak. The audience found it charmingly ironic, Allen said, that Harpo, who had never before spoken on stage or screen, "wouldn't shut up!" Harpo, an avid croquet player, was inducted into the Croquet Hall of Fame in 1979. Harpo Marx died on September 28, 1964 (his 28th wedding anniversary), at age 75 in a West Los Angeles hospital, one day after undergoing heart surgery. Harpo's death was said to have hit the surviving Marx brothers very hard. Groucho's son Arthur
Karl Marx and the Close of His System has been seen as one of the most important discussions of Marx's economic theories, along with Rudolf Hilferding's "Böhm-Bawerk's Criticism of Marx", a defense of Marx against Bawerk. Bawerk's work is the "classical" critique of "Capital". Most subsequent critiques of Marxist economics have repeated Bawerk's arguments. Marxist economist Ernest Mandel identifies "Karl Marx and the Close of His System" as part of a literature, beginning with German social democrat Eduard Bernstein, that criticizes the dialectical method Marx borrowed from Georg Wilhelm Friedrich Hegel as "useless", "metaphysical", or "mystifying." He faults Böhm-Bawerk and the other critics for what he regards as