This defining and original book explores the history of monopoly power and of its relation to competition, focusing on the innovative contributions of the Italian marginalists - Pareto, Pantaleoni, De Viti de Marco and Barone. Manuela Mosca analyses their articulate vision of competition, and the structural and strategic entry barriers considered in their works to enrich existing literature on the history of the sources of market power. The book is not limited to the reconstruction of the elaboration of pure theory, it also highlights its policy implications and how this group applied...