Guillaume Hollard, Directeur de recherche CNRS, Professeur à l'École Polytechnique

Le séminaire du jeudi 20 mars 2025 est animé par Guillaume Hollard, Directeur de recherche CNRS au laboratoire CREST et Professeur à l'École Polytechnique.

Guillaume Hollard travaille dans les domaines de la prise de décision publique et individuelle ainsi que sur les méthodes expérimentales en économie.

Titre de sa présentation : Rate My Product: How Yuka is Reshaping France’s Food and Cosmetic Markets.

Résumé : We leverage large-scale evidence on food and cosmetic ratings generated by millions of users of a rating app, with billions of scans. Our study highlights the role of digital rating platforms in shaping market dynamics, particularly in industries where consumers rely heavily on third-party assessments. We show that products with a strong "credence" dimension—where quality and safety remain difficult to evaluate even after consumption—are significantly more likely to be reformulated by firms. In contrast, products whose quality can be inferred through repeated consumption tend to be less affected, if at all, by the diffusion of information. We then explore potential confounding factors and offer insights into the ongoing debate on food and cosmetics labeling.

Le séminaire a lieu à 13h30  en salle 227.