Marx Brothers stage during the middle of a Groucho monologue to see if Groucho would be thrown off. However, to the audience's delight, Groucho merely reacted by commenting, "First time I ever saw a taxi hail a passenger". When Harpo chased the girl back in the other direction, Groucho calmly checked his watch and ad-libbed, "The 9:20's right on time. You can set your watch by the Lehigh Valley." The brothers' vaudeville act had made them stars on Broadway under Chico's management and with Groucho's creative direction—first with the musical revue "I'll Say She Is" (1924–1925) and then with two musical comedies:
Marx after Sraffa after Sraffa" as another critique of Marx's "Capital", and accused Steedman of misunderstandings of Marx similar to those made by Paul Sweezy in his "The Theory of Capitalist Development" (1942). Marx after Sraffa Marx after Sraffa is a 1977 book about Marxist economics by the economist Ian Steedman, in which the author argues against the labor theory of value. Steedman has been criticized for alleged misunderstandings of Karl Marx. The economist Heinz D. Kurz reviewed "Marx after Sraffa" in "Kyklos". The political scientist David McLellan wrote in the 1995 edition of his "" that Steedman's reading of Marx has been