Although prominently featuring the word "philosophy" in its title, The Poverty of Philosophy is essentially a book dealing with the subject of economics—first English-language translator Harry Quelch noted that the work contained "the groundwork of the theories so fully elaborated in Capital, apart from its exhaustive analysis of the capitalist system of production and distribution"[15] as well as law of value[16] To argue the method to apply the dialectics to political economy, he cites the Science of Logic of Hegel.[17] And Marx rejects idea of Proudhon on consumption tax[18] and denial of strike action.[19] And the end of the book, he cites the words of George Sand that "Combat or Death: bloody struggle or extinction. It is thus that the question is inexorably put.".[20] Further he cites the theory of John Gray.[21] Indeed, the book has been called by one Soviet scholar, "one of the first works of mature Marxism."[22]