Paper: Competition and Reputation in an Online Marketplace: Evidence from Airbnb
Management Science, INFORMS, Michelangelo Rossi, April 2023
This paper studies how competition affects the role of reputation in encouraging sellers to exert effort. More competition disciplines sellers, but at the same time, it erodes reputational premia. This paper identifies whether one effect dominates the other using data from Airbnb. I exploit the introduction of a short-term rental regulation effective in San Francisco in 2017 that halved the number of short-term listings on the platform. I focus on hosts who are present on the platform before and after the regulation, and I identify a negative causal effect of the number of competitors on ratings about hosts’ effort. I extend this result with two other measures of effort: hosts’ response rate and response time. I confirm that hosts exert less effort when the number of competitors increases. The rate of responses within 24 hours decreases, and response time increases.
https://awards.concurrences.com/en/awards/2024/academic-articles/competition-and-reputation-in-an-online-marketplace-evidence-from-airbnb
Roland Rathelot, professor at ENSAE Paris and researcher at CREST, winner of an ERC-Consolidator 2022 grant
Roland Rathelot, professor at ENSAE Paris and at the Institut Polytechnique de Paris, researcher at the Centre de Recherche en Économie et STatistique (CREST) and Hi! PARIS joins the list of the already 3 scientific talents of CREST to obtain an ERC grant. His research focuses on the job search process, discrimination by ethnic origin and gender differences in the labor market.
Thanks to his ERC Consolidator grant, Roland Rathelot will work on the INASHI project in which he will study the nature of informational frictions that employers encounter during the recruitment process.
Many countries have both high unemployment rates and unfilled vacancies. Informational frictions are one possible source of this dual problem. On the one hand, job seekers may lack information about how the labor market works or how their skills are assessed. On the other hand, employers may find it difficult to assess the profile of applicants. The INASHI project focuses on this second hypothesis and aims to quantify and qualify the information deficits that employers encounter when they decide to post a job offer, or when they evaluate the applications received.
INASHI also aims to measure the macroeconomic consequences of these informam frictions and to propose solutions. Roland Rathelot and his co-authors will combine the use of administrative date sources and randomized experiments in three European countries: Austria, France and Sweden.
ICML 2021: Congratulations to our Researchers
Crest papers accepted at the international Conference on Machine Learning (ICML)
The Crest is pleased to present the work of its researchers and professors at the 38th International Conference on Machine Learning (ICML) being held this week (July 18-24, 2021).
The ICML conference is world-renowned for presenting and publishing cutting-edge research on all aspects of machine learning, and is one of the fastest growing AI conferences in the world.
Congratulations to our Researchers Marco Cuturi, Anna Korba, Vianney Perchet, Flore Sentenac, Meyer Scetbon (ENSAE Paris, Institut Polytechnique de Paris) an Romaric Gaudel (ENSAI Rennes).
https://www.hi-paris.fr/2021/07/10/hi-paris-at-icml-2021/
Congratulations to Anna Simoni and Arnak Dalalyan for their Hi!Paris Fellowships 2021
Frédérique Bec nommée membre du Haut Conseil des Finances Publiques
Anasuya Raj wins PhD Award
Congratulations to Anasuya Raj for her 2021 PSL SHS Dissertation Prize in « Law, Economics, Management »
Three CREST researchers selected for the ERC Starting Grants 2021 Evaluation Step 2
ERC Starting Grants 2021: Congratulations to CREST researchers Victor-Emmanuel Brunel, Pauline Rossi and Felix Tropf whose proposals in mathematics, economics and sociology have been selected for Step 2 of the evaluation! We wish them good luck at the next stage!
Clémence Tricaud and Boris Muzellec receive IP_Paris Best Thesis Award
Congratulations to Clémence and Boris for their Award
Chercheurs ayant rejoint le réseau Louis Bachelier Fellows en 2021
Nous félicitons les membres du Crest qui viennent de rejoindre le réseau Louis Bachelier Fellows.
Par ordre alphabétique, les membres du Crest de la section College Academic Fellows:
2021
Stéphane Auray est macroéconomiste, Professeur des Universités en détachement à l’ENSAI et chercheur au CREST.
Valentin Patilea est professeur des universités à l’ENSAI, Directeur de la recherche et responsable du MSc in Statistics for Smart Data.
Pierre Picard est professeur d’économie et membre du Haut Collège de l’Ecole Polytechnique. Il est chercheur en économie du risque et de l’assurance.
Anna Simoni est chercheuse au CNRS, affiliée au CREST, et professeur de statistiques et d’économétrie à l’ENSAE et à l’Ecole Polytechnique.
Francesco Violante est chercheur en économie associé au CREST et chercheur international associé du CREATES.
Jean-Michel Zakoian est chercheur en économétrie de la finance, professeur détaché à l’ENSAE-CREST, responsable du laboratoire Finance-Insurance au CREST.
Années antérieures:
Patricia CRIFO, Ecole Polytechnique, Fellow depuis 2020
Mathieu ROSENBAUM, Ecole Polytechnique, Sorbonne Université, Fellow depuis 2020
Caroline HILLAIRET, ENSAE & CREST, Fellow depuis 2019
Peter TANKOV, ENSAE, Fellow depuis 2019
Nicole EL KAROUI, Ecole Polytechnique, Fellow depuis 2016
Jean-Pierre PONSSARD, Ecole Polytechnique, Fellow depuis 2016
Nizar TOUZI, Ecole Polytechnique, Fellow depuis 2016
Christine Zulehner is a new member of the Scientific Advisory Board of the German BMWi
Christine Zulehne is a researcher at CEPR , Research Affiliate at CREST and a new member of the scientific council of the German Federal Ministry of Economics and Energy.