Organised by the Governance and Regulation Chair.

Özlem Bedre-Defolie, Associate Professor of Economics (with tenure) at ESMT Berlin.

It will be postponed to a later date in spring.

Mardi 22 novembre 2022
12h15 - 13h30
A 409 - Université Paris Dauphine

"Hybrid Platform Model" joint with Simon Anderson

Özlem Bedre-Defolie

We provide a canonical and tractable model of a trading platform which controls the product variety it hosts and product prices by charging a percentage fee on sellers and choosing whether to sell its own product (hybrid mode). We micro-found and derive a mixed market demand system for differentiated products to capture interactions between monopolistically competitive sellers and a sizeable range of platform products. The hybrid platform steers consumers towards its products by charging higher seller fees than pure marketplace. This "insidious steering" intensifies the better the platform's own products. Banning hybrid mode benefits consumers if and only if the ban leads to pure marketplace. The hybrid platform debases third-party products if its products are strong enough. We capture two-sided network effects by endogenizing buyer participation via costs to discover tastes for products and seller participation via an aggregate manipulated by the platform’s fee.

The seminar will be held in person at Dauphine-PSL, and on line:

Click here to register for an attendance in person (and have lunch)

Click here to join the seminar online