his book reviews recent progress in the theory of oligopoly and market leadership and provides new results on the theory of Stackelberg competition and Nash competition with strategic investment under endogenous entry. These theories are applied to models of competition in quantities, prices and...

We propose a novel approach to study competition among platforms. In particular, we consider representative consumer's preferences over the services platforms provide and the commodities they intermediate. Platforms are assumed to be large, intermediating a variety of commodities offered by...