In his principal work, Principles of Political Economy (three volumes, 1893–1901), he closely follows John Stuart Mill in his selection of material, but employs statistical and historical discussion, instead of the abstract reasoning from simple assumption that characterises Mill's work.
In his principal work, Principles of Political Economy (three volumes, 1893–1901), he aligns with John Stuart Mill in the choice of material but uses statistical and historical methods instead of Mill's abstract reasoning from simple assumptions.