The junior seminar aims at gathering PhD students and post-docs whose research topics deal with game theory in a broad sense. During the seminar, the participants may present their works, advanced or in progress, to their peers. They may also present articles they believe are interesting (in a journal club fashion). They can be theoretical economists, mathematicians, and computer scientists. The seminar will take place around every two weeks on Mondays, 10am, before the senior game theory seminar. Participants who want to be speakers are most welcome and should contact the organizers.
The next issue is on December 8th, 10am at the IHP (room 201).
Alex Tordjman will present his work "The Limits of Auctions under Ex-Ante Collusion".
Abstract: We study revenue-maximizing auction design when bidders can form a bidding ring ex ante—i.e., before learning their values and before each bidder decides whether to participate in the auction. We show that bidders’ ex-post private information about values does not preclude them from colluding efficiently, and as a result, the seller cannot achieve a higher revenue than from posting an optimal price and rationing the good. However, a posted-price mechanism leaves the seller vulnerable to inefficient collusion. We construct mechanisms that guarantee the non-collusive revenue of an optimal posted price against arbitrary collusion, even if a subset of bidders can form a bidding ring ex ante that can observe participants’ values and commit to punish bidders who refuse to join. With symmetric bidders, this guarantee can be achieved by a mechanism that simply combines a posted price with a first-price knockout auction conducted by the seller on behalf of the bidders.
(Joint with Ravi Jagadeesan and Ilya Segal)
Expected schedule:
September 29th: Francesco Giordano
October 13th: Ivan Conjeaud
November 3rd: Polina Borisova
November 10th: David Lurie
November 17th: Aviman Satpathy
December 1st: Alexandre Arnout
December 8th: Alex Tordjman
December 15th: Antoine Scheid
January 5th: Aymeric Capitaine
January 12th: Diego San Roman
February 16th: TBA
March 9th : TBA
March 23th: TBA
April 6th: Melissa Tamine
May 4th: TBA
May 18th: Giuseppe Puleio
June 1st: TBA
June 15th: TBA
Organizers:
Julian Chitiva (julian.chitiva[at]hec[dot]edu),
Melissa Gonzalez Garcia (melissa.gonzalez-garcia[at]dauphine[dot]eu),
Emmanuel Lagrée (emmanuel.lagree[at]assas-universite[dot]fr),
David Lurie (david.lurie[at]dauphine[dot]eu),
Cyril Rouault (cyril.rouault[at]universite-paris-saclay[dot]fr).
Former Organizers: Felipe Garrido-Lucero.