Humboldt-Universität zu Berlin - School of Business and Economics

Workshop 2009 (Toulouse)


“Market Power in Vertically Related Markets”

Toulouse, March 16-17, 2009


Organized by: 

Stéphane Caprice, TSE, GREMAQ-INRA


Christelle Fauchié, e-mail :


Olivia Vongsavath, e-mail :

Venue :

Université Sciences Sociales Toulouse I

Manufacture des Tabacs

21 Allée de Brienne

Builiding F, 3rd Floor – Room MF 323



Speakers have 40 minutes, discussants 15 minutes, remaining time for open questions

Monday, March 16th, 2009

13:00-13:30        Registration and Coffee

13:30-13:40        Introduction and Welcome by Patrick Rey (TSE, IDEI)

13:40-15:40        Session I                                                            Chair: Marie-Laure Allain


Pio Baake (DIW Berlin) and Vanessa Schlippenbach (DIW Berlin)

Quality Uncertainty in Vertical Relations: Mutual Dependency Mitigates Inefficiencies

Discussant: Jacques Crémer (TSE, IDEI)


Marie-Laure Allain (CNRS, Ecole Polytechnique), Claire Chambolle (INRA-ALISS, Ecole Polytechnique) and Clémence Christin (Ecole Polytechnique)

Downstream Competition, Exclusive Dealing and Upstream Collusion

Discussant: Markus Reisinger (University of Munich)


15:40-16:10        Coffee Break


16:10-18:10        Session II                                                           Chair: Claire Chambolle


Özlem Bedre (TSE, GREMAQ) and Stéphane Caprice (TSE, GREMAQ-INRA)

Inefficient buyer mergers to obtain size discounts

Discussant: Thibaud Vergé (CREST, LEI)


Claire Chambolle (INRA-ALISS, Ecole Polytechnique) and Sofia Villas-Boas (UC Berkeley)

Buyer Power through Producers’ Differentiation

Discussant: Doh-Shin Jeon (Universitat Pompeu Fabra and TSE)

20:00                     Dinner

Tuesday, March 17th, 2009

08:30-10:30        Session III                                                          Chair: Zohra Bouamra-Mechemache


Konrad Stahl (University of Mannheim) and Roland Strausz (Humboldt University, Berlin)

Certification and exchange in vertically concentrated markets

Discussant: Philippe Bontems (TSE, GREMAQ-INRA)


Fabian Bergès (TSE, GREMAQ-INRA) and Zohra Bouamra-Mechemache (TSE, GREMAQ-INRA)

Is producing a private label counterproductive for a branded manufacturer?”

Discussant: Marie-Laure Allain (CNRS, Ecole Polytechnique)


10:30-11:00        Coffee Break


11:00-12:00        Session IV                                                         Chair: Stéphane Caprice


Erik Fasten (Humboldt University, Berlin) and Dirk Hofmann (Humboldt University, Berlin)

Two-sided Certification - the Market for Rating Agencies

Discussant: Bruno Jullien (TSE, IDEI)


12:00-13:30        Lunch                                                                                                  ME 001


13:30-15:30        Session V                                                           Chair: Vanessa Schlippenbach


Doh-Shin Jeon (Pompeu Fabra University and TSE) and Domenico Menicucci (Università degli Studi di Firenze)

Bundling and Competition for Slots: On the Portfolio Effects of Bundling

Discussant: Eric Avenel (Grenoble University)


Vanessa Schlippenbach (DIW Berlin) and Christian Wey (DIW Berlin)

One-Stop Shopping Behavior and Upstream Merger Incentives

Discussant: Claude Crampes (TSE, IDEI)

15:30-15:50        Coffee Break

15:50-16:50        ANR-DFG Meeting                                                                                       MF323

Reserved for the members of the ANR-DFG project