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...

We study platform competition by modeling the preferences of a "representative buyer" over the services platforms provide and the commodities they intermediate. This captures an intensive margin of buyers' participation which is neglected by the canonical setting and delivers a welfare measure...

Markups vary widely across industries and countries, their heterogeneity has increased overtime and asymmetric exposure to international trade seems partly responsible for this phenomenon. In this paper, we study how the entire distribution of markups affects resource misallocation and welfare...