Titre : Crowding out effects associated with the Olympics. Some lessons learned from ex ante surveys in Paris and Tokyo Auteurs : Marie Delaplace, Florian Moussi-Beylie, Alexandra Schaffar, Arima Takayuki, Minami Soichiro, Akyama Tetsuo, Revue : City and Tourism Numéro : Issue 1 Volume : 2 Date : 2023/02/27 DOI : 10.21494/ISTE.OP.2023.0932 ISSN : 2976-5897 Résumé : The Olympic and Paralympic Games generate expectations in terms of tourist attraction, but the ex post literature relativizes them due to crowding out effects. In order to understand these possible effects in 2020 in Tokyo and those likely to take place in Paris in 2024, two surveys were carried out with 305 international tourists in Tokyo and 1,265 international and French tourists in Paris respectively. If the pandemic has called into question the interest of research for Tokyo, since the JOP, postponed to 2021, took place without spectators, these surveys nevertheless make it possible to draw a certain number of lessons on the type of tourists likely to divert from Paris in 2024. Éditeur : ISTE OpenScience