"In From Online Platforms to Digital Monopolies: Technology, Information and Power Jonas C.L. Valente discusses the rise of platforms as key players in different social activities, from economy to culture and politics. These companies have a daily presence in the lives of the majority of the...

This pioneering empirical study, of the behavior of firms in a differentiated oligopoly, has four contributions. First, it defines clusters of competitive firms based on (a) homogeneity of products, (b) their geographic proximity, (c) the resources available and competence of the management,...