My class on personal income distribution theories (within-nations) begins with Pareto. Pareto will indeed be for ever part of such classes because he was the first economist to have been seriously interested in empirical analysis of inter-personal inequality. Before him, economics was about functional income distribution which, of course, makes sense if you assume that all workers are at subsistence, all capitalists rich, and all landlords even richer. Then, you do not need to bother with inter-personal inequality. It is just a transformation of factoral income distribution. (This is, I think, most obvious in Ricardo who cannot even conceive of a possibility of wages ever going above subsistence—except temporarily to precipitate the Malthusian movement. The advantage for modeling—since Ricardo’s “Principles” are in reality an exercise in verbal modelling—is that you have one fixed quantity and you can then let others vary).
It is just a minor simplification to say that Pareto thought that there was an iron law of income distribution, namely that inequality did not change whatever social system was in power. It gave consistency to his theory of the circulation of the elites, because whatever elite be in power (land-owning, capitalist or bureaucratic), income distribution would be the same although the people who would be rich or poor would be different. It was a serious critique of the idea that Marxist socialism would reduce income inequalities.
What remains of Pareto’s claim? Several things are clear now--more than a century after Pareto defined his power low and showed that the number of recipients of a given income decreases in proportion as that income threshold is raised. Pareto law does not apply to any entire distribution.Global Inequality
What remains of Pareto?
Branko Milanovic | Visiting Presidential Professor at City University of New York Graduate Center and senior scholar at the Luxembourg Income Study (LIS), and formerly lead economist in the World Bank's research department and senior associate at Carnegie Endowment for International Peace