His writings represent a compromise between the methods of the historical school of German economics and those of the English deductive school. 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 which characterizes Mill's work. Among his other writings are:
^Hutton, Alan (2006). "A Scottish tradition of applied economics in the twentieth century". In Alexander Dow, Sheila Dow. The history of Scottish economic thought. London: Routledge. pp. 237–238. ISBN0415344379.