# New Perspectives on Substitutes

New Perspectives on Substitutes

Paris, June 2-3, 2023

*Organizers: Alfred Galichon (New York University and Sciences Po) and Larry Samuelson (Yale University)*

Substitutability has found itself at the core of modern economic modeling for two reasons. First, it arises naturally in classes of models such as one-to-one matching, discrete choice, hedonic models, and many others. Second, it leads to successful numerical methods, such as the greedy algorithm in the discrete case, and the Jacobi algorithm related ones in the continuous case. Leading experts in the field will gather to make a link between discrete and continuous models and to explore recent theoretical developments and economic applications.

Abstracts can be found here.

Papers can be found here.

Slides can be found here.

*The workshop is accessible to the public but registration is mandatory by emailing ag133@nyu.edu.*

**Friday June 2, 2023**

**Location: Sciences Po (27 rue Saint Guillaume, room AS)**

1230pm-130pm: luncheon buffet (room AS)

*Session 1*

130pm-215pm: Renato Paes Leme: “Gross Substitutes: Representation and Approximation”

215pm-300pm: Xin Chen / Menglong Li: “S-Convexity and Gross Substitutability”

300pm-330pm: break

*Session 2*

330pm-415pm: Alexander Teytelboym: TBA

415pm-500pm: Jonathan Weinstein: “Direct Complementarity”

5pm-530pm: break

*Session 3*

530pm-615pm: Lucas Vernet: “Monotone Comparative Statics for Equilibrium Problems”

615-700pm: Ravi Jagadeesan: “Understanding Demand Types and Discrete Convexity”

700pm-730pm: dinner (invitation only): Chez Francoise, Aérogare des Invalides, 75007 Paris

https://goo.gl/maps/9HEZ9nMkRmcJrWkA6

**Saturday June 3, 2023**

**Location: NYU Paris ****(57 boulevard Saint-Germain, 75005 Paris)**

*Session 4*

0915am-10am: Faruk Gul: “Efficient Allocation of Indivisible Goods in Pseudo Markets with Constraints”

1000am-1045am: Pawel Dziewulski: “It’s all about parallelograms: comparative statics in quasilinear settings”

1045am-1115am: break

*Session 5*

1115am-1200pm: Elizabeth Baldwin: “Implementing Walrasian Equilibrium: The Language of Product-Mix Auctions”

1200pm-1245pm: Maxime Sylvestre: “Monotone comparative statics for submodular functions, with an application to aggregated deferred acceptance”

1245pm-130pm: Wolfgang Pesendorfer: “Lindahl Equilibrium as a Collective Choice Rule”

130pm lunch (invitation only): Les Papilles, 30 rue Gay Lussac, 75005 Paris

https://goo.gl/maps/73TVUbfvkG4cieXp7