Based on a systematic review and evaluation of business reports, documents, statistics, literature and press releases, this paper analyzes the market concentration and the expansion and innovation strategies of the leading internet companies Google, Facebook, Apple, Amazon and Microsoft. The...

We propose an economic model of business groups that allows for the cooperative behavior of groups of firms, where the number and size of each group is determined endogenously. In this framework, more than one configuration of groups can arise in equilibrium: several different types of business...