This version: July 2005 The notion of market power in the Italian marginalist school: Vilfredo Pareto and Enrico Barone Manuela Mosca* Abstract The paper deals with the notion of market power in the writings of two well-known Italian marginalists: Vilfredo Pareto (1848-1923), and Enrico Barone (1859-1924). It brings into focus the two economists’ definition of the sources of market power, the kind of entry barriers the identified, and the role they attributed to potential competition. It shows that even if Pareto and Barone did not provide original analytical contributions to the solution of the models of price determination in imperfectly competitive markets, they should still have a place in the history of the theory of non-competitive markets for their theoretical innovations concerning the causes of market power. Keywords : market power, marginalism. J.E.L. Classification: B13, D4 Address for correspondence: Manuela Mosca University of Lecce, Dipartimento di Scienze Economiche e Matematico-Statistiche, Ecotekne, Via per Monteroni, 73100 Lecce (Italy). E-mail:
[email protected] * A previous version of this paper was presented at HES 2005 Conference. 32 nd Annual Meeting. Tacoma 24-27th June, 2005. I am grateful to S. Abu Turab Rizvi for helpful comments and suggestions. The usual disclaimer applies. Any opinions expressed in the papers included into the Quaderni del Dipartimento di Scienze Economiche e Matematico- Statistiche are those of the authors. Citation and use of these papers should consider their provisional character. 1. Introduction This paper analyses the notions of competition and monopoly power in the writings of two well-known Italian marginalists: Vilfredo Pareto (1848-1923) and Enrico Barone (1859-1924).