Marx Brothers from singing with comedy to comedy with music. The brothers' sketch "Fun in Hi Skule" featured Groucho as a German-accented teacher presiding over a classroom that included students Harpo, Gummo, and Chico. The last version of the school act was titled "Home Again" and was written by their uncle Al Shean. The "Home Again" tour reached Flint, Michigan in 1915, where 14-year-old Zeppo joined his four brothers for what is believed to be the only time that all five Marx Brothers appeared together on stage. Gummo then left to serve in World War I, reasoning that "anything is better than
Karl Marx and the Close of His System labour value, he argues that the basic error in Marx's system resulted from a self-contradiction of Marx's law of value, namely how the rate of profit and the prices of production of the third volume of Marx's "Capital" contradict Marx's theory of value in the first volume. He maintains that since the law of value is not directly controlling in capitalist production, the theory of value must be abandoned. Bawerk also attacks Marx for downplaying the influence of supply and demand in determining permanent price, and for deliberate ambiguity with such concepts. "Karl Marx and the Close of His System"