Online seminar on the Economics of Platforms

April 14, 2020 Research

The online Economics of Platforms Seminar will meet fortnightly.

Hosted by TSE Digital Center, this virtual seminar series is focused on the economics of platforms. Seminars can cover all aspects related to the economics of platforms including, for example, competition, strategy, design, governance, and policy issues. We hope to attract a good mix of applied theory, empirical papers, and policy discussions.

Upcoming Talks

Seminars will take place every other Tuesday at 2.00 PM Paris Time via Zoom.

- Tuesday, November 30, 2021: Erik Madsen (New York University), Insider Imitation (with Nikhil Vellodi)
Moderator: Özlem Bedre-Defolie (ESMT-Berlin). Discussant: Justin Johnson (Cornell University)

Past Talks

- Tuesday, November 16, 2021: Kohei Kawaguchi (Hong Kong University of Science and Technology), Merger Analysis in the App Economy: An Empirical Model of Ad-Sponsored Media (with Toshifumi Kuroda and Susumu Sato)
Moderator: Shota Ichihashi (Bank of Canada). Discussant: Daniel Ershov (Toulouse School of Economics)
- Tuesday, November 2, 2021: Timothy Simcoe (Boston University), Complementary Multi-Sided Platforms (with Doh-Shin Jeon, Yassine Lefouili and Yaxin Li)
Moderator: Hanna Halaburda (New-York Stern), Discussant: Alex White (Tsinghua University)
- Tuesday, October 19, 2021: Ginger Zhe Jin (University of Maryland), Platform as a Rule Maker: Evidence from Airbnb's Cancellation Policies (with Jian Jia and Liad Wagman)
Moderator: Andrey Fradkin (Boston University). Discussant: Konrad Stahl (University of Mannheim)
- Tuesday, October 5, 2021: Thomas Philippon (New-York University), Data Sharing and Market Power with Two-Sided Platforms (with Rishabh Kirpalani)
Moderator: Alexandre de Cornière (Toulouse School of Economics). Discussant: Shota Ichihashi (Bank of Canada).
- Tuesday, September 21, 2021: Jacopo Bregolin (Toulouse School of Economics), Authority and Delegation in Online Communities
Moderator: Chiara Farronato (
Harvard Business School). Discussant: Kevin Boudreau (Northeastern University)
- Tuesday, September 7, 2021: Alexander White (Tsinghua University), Optional Intermediaries and Pricing Restraints (with Chang Liu and Fengshi Niu)
Moderator: Alexandre de Cornière (Toulouse School of Economics). Discussant: Julian Wright (National University of Singapore)
- Tuesday, August 10, 2021: Holiday break
- Tuesday, August 24, 2021: Holiday break
- Tuesday, July 27, 2021: Hanna Halaburda (NYU-Stern), Will Blockchain Disrupt Platform Businesses?
 Moderator: Greg Taylor (University of Oxford). Discussant: Andrei Hagiu (Boston University)
- Tuesday, July 13, 2021: Leonardo Madio (University of Padova), The Economics of Platform Liability (with Yassine lefouili)
Moderator: Emilio Calvano (University of Bologna). Discussant: Kathryn Spier (Harvard Law School)
- Tuesday, June 29, 2021: Tat-How Teh (National University of Singapore), Multihoming and Oligopolistic Platform Competition (with Chunchun Liu, Julian Wright and Junjie Zhou))
Moderator: Andrei Hagiu (Boston University). Discussant: Markus Reisinger (Frankfurt School of Finance and Management)
- Tuesday, June 15, 2021: Susan Athey (Stanford University), Platform Annexation (with Fiona Scott Morton)
Moderator: Julian Wright (National University of Singapore). Discussant: Steven C. Salop (Georgetown University Law Center)
- Tuesday, June 1, 2021: Arun Sundararajan (New-York University), The Limits of Centralized Pricing in Online Marketplaces and the Value of User Control (with Apostolos Filippas Fordham and Srikanth Jagabathula)
Moderator: Andrey Fradkin (Boston University), Discussant: Shane Greenstein (Harvard Business School)
- Tuesday, May 18, 2021: Kai Hao Yang (Yale University), Equivalence in Business Models for Informational Intermediaries
Moderator: Emilio Calvano (University of Bologna), Discussant: Daniele Condorelli (University of Warwick)

- Tuesday, April 20, 2021: John J. Horton (MIT Sloan & NBER), Pricing in Designed Markets: The Case of Ride-Sharing (with Jonathan V. Hall and Daniel T. Knoepfle)
Moderator: Marc Rysman (Boston University). Discussant: Juan Camilo Castillo (University of Pennsylvania)

- Tuesday, April 6, 2021: Shota Ichihashi (Bank of Canada), Addictive Platforms (with Byung-Cheol Kim)
Moderator: Greg Taylor (University of Oxford). Discussant: Tommaso Valletti (Imperial College Business School)

- Tuesday, March 23, 2021: Hsin-Tien Tsai (NUS), Steering via Algorithmic Recommendations (with Nan Chen)
Moderator: Chiara Farronato (Harvard Business School). Discussant: Daniel Ershov (Toulouse School of Economics)

- Tuesday, March 9, 2021: Alessandro Bonatti (MIT), The Economics of Social Data (with Dirk Bergemann and Tan Gan)
Moderator: Alexandre de Cornière (Toulouse School of Economics). Discussant: Jay Pil Choi (Michigan State University)

- Tuesday, February 23, 2021: Ulrich Laitenberger (Telecom-ParisTech), Vertical Integration of Platforms and Product Prominence" (with Morgane Cure, Matthias Hunold, Reinhold Kesler and Thomas Larrieu)
Moderator: Feng Zhu (Harvard Business School), Discussant: Marc Ivaldi (Toulouse School of Economics)

- Tuesday, February 9, 2021: Ruslan Momot (HEC Paris), Digital Privacy (with Itay P. Fainmesser and Andrea Galeotti)
Moderator: Greg Taylor (University of Oxford). Discussant: Alex Smolin (Toulouse School of Economics)

- Tuesday, January 26, 2021: Luigi Zingales (University of Chicago), Kill Zone, (with Sai Krishna Kamepalli and Raghuram Rajan)
Moderator: Özlem Bedre-Defolie (ESMT-Berlin), Discussant: Luis Cabral (NYU Stern)

- Tuesday, January 12, 2021: Oren Reshef (Washington University in St Louis), Smaller Slices of a Growing Pie: The Effects of Entry in Platform Markets
Moderator: Andrey Fradkin (Boston University). Discussant: John Horton (MIT Sloan School of Management)

- Tuesday, December 29, 2020: Break

- Tuesday, December 15, 2020: Özlem Bedre-Defolie (ESMT-Berlin), Hybrid Platform Model (with Simon Anderson)
Moderator: Alexandre de Cornière (Toulouse School of Economics). Discussant: Heski Bar-Isaac (University of Toronto)

- Tuesday, December 1, 2020: Seth Benzell (MIT Initiative on the Digital Economy), How to Govern Facebook: A Structural Model for Taxing and Regulating Big Tech (with Avinash Collis)
Moderator: Hanna Halaburda (NYU-Stern). Discussant: Alex White (Tsinghua University)

- Tuesday, November 17, 2020: Jay Pil Choi (Michigan State University), Two-Sided Platforms and Biases in Technology Adoption (with Doh-Shin Jeon)
Moderator: Andrei Hagiu (Boston University). Discussant: Martin Peitz (University of Mannheim)

Tuesday, November 3, 2020: Zhijun Chen (Monash University), Data-Driven Mergers and Personalization (with C. Choe, J. Cong and N. Matsushima) 
Moderator: Alexandre de Cornière (Toulouse School of Economics). Discussant: Greg Taylor (University of Oxford)

- Tuesday, October 20, 2020: Benjamin Leyden (Cornell University), Platform Design and Innovation Incentives: Evidence from the Product Ratings System on Apple's App Store
Moderator: Andrei Hagiu (Boston University). Discussant: Georgios Zervas (Boston University)

- Tuesday, October 6, 2020: Gregory Lewis (Microsoft Research), The Supply and Demand Effects of Review Platforms (with Georgios Zervas)
Moderator: Andrey Fradkin (Boston University). Discussant: Chiara Farronato (Harvard Business School)

- Tuesday, September 22, 2020: Andrew Rhodes (Toulouse School of Economics), Platform Design when Sellers Use Pricing Algorithm (with Justin Johnson and Matthijs Wildenbeest) 
Moderator: Hanna Halaburda (NYU-Stern). Discussant: Alexander MacKay (Harvard Business School)

- Tuesday, September 8, 2020: Nikhil Vellodi (Princeton University and Paris School of Economics), Rating Design and Barriers to entry, 
Moderator: Alexandre de Cornière (Toulouse School of University). Discussant: Maryam Saeedi (Carnegie Mellon University)

Tuesday, August 25, 2020: (Cancelled for EEA 2020)

- Tuesday, August 11, 2020: (Break)

- Tuesday, July 28, 2020: Ananya Sen (Carnegie Mellon University), The Editor vs. the Algorithm: Economic Returns to Data and Externalities in Online News (with Jörg Claussen and Christian Peukert)
Moderator: Feng Zhu (Harvard Business School)

- Wednesday, July 15, 2020: Lester Chan (Boston University), Divide and Conquer in Two-Sided Markets: A Potential-Game Approach
Moderator: Hanna Halaburda (NYU-Stern)

- Tuesday, June 30, 2020: Andrey Fradkin (Boston University), Dog Eat Dog: Measuring Returns to Scale Using a Digital Platform Merger (with Chiara Farronato and Jessica Fong)
Moderator: Feng Zhu (Harvard Business School) 

- Tuesday, June 16, 2020: Maryam Saeedi (Canergie Mellon University), Optimal Rating Systems on Platforms (with Hugo Hopenhayn)
Moderator : Alexandre de Cornière (Toulouse School of University)

- Tuesday, June 2, 2020Özlem Bedre-Defolie (ESMT-Berlin), Platform Competion for Exclusivity with a Marquee Seller (with Gary Biglaiser)
Moderator : Hanna Halaburda (NYU-Stern)

- Tuesday, May 19, 2020: Renato Gomes (Toulouse School of Economics), Regulating Platform Fees under Price Parity (with Andrea Mantovani)
Moderator: Andrei Hagiu (Boston University)

- Tuesday, May 5, 2020: Hui Li (Carnegie Mellon University), Information Transparency, Multi-Homing, and Platform Competition: A Natural Experiment in the Daily Deals Market (with Feng Zhu) 
Moderator: Marc Rysman (Boston University)

- Tuesday, April 21, 2020: Andrei Hagiu (Boston University), Data enabled learning, network effects and competitive advantage (with Julian Wright)
Moderator: Alexandree de Cornière (Toulouse School of Economics)


Scientific Committee


Co-chairs: Jacques Crémer (Toulouse School of Economics), Andrei Hagiu (Boston University), Julian Wright (National University of Singapore)

Members: Luis Cabral (NYU-Stern School of Business), Emilio Calvano (University of Bologna), Alexandre de Cornière (TSE), Jacques Crémer (TSE), Özlem Bedre-Defolie (ESMT-Berlin), Chiara Farronato (Harvard Business School), Andrey Fradkin (Boston University-Questrom School of Business), Hanna Halaburda (NYU-Stern School of Business), Doh-Shin Jeon (TSE), Martin Peitz (University of Mannheim), Marc Rysman (Boston University), Greg Taylor (University of Oxford), Catherine Tucker (MIT Sloan School of Management), Feng Zhu (Harvard Business School).

Seminar guidelines

The speaker will present for 40 mins, 5 mins for the discussant and we will have 15 mins for Q&A. Each seminar will be moderated, and participants can post their questions to the chat room on Zoom. Questions will usually be channeled through the moderator. Participants (other than the speaker and moderator) should leave their mic off unless asked by the moderator to speak." More detailed rules will be shared in due course.


To propose a talk, please contact one of the co-chairs of the Scientific Committee:

Andrei Hagiu: or Julian Wright:

For questions pertaining to the organization of the seminar, including being added to our mailing list, please contact Marie-Hélène Dufour