Before revision:  Chapters 3 and 4 argue that despite the fact that the founders of the neoclassical school had shown an active interest in  worker poverty, the issues of production and distribution became discussed separately among neoclassicals.
After revision:  Chapters 3 and 4 argue that despite the fact that the founders of the neoclassical school had shown an active interest in social issues, namely worker poverty, the issues of production and distribution became discussed separately among neoclassicals.