🏆 PSE & the ENS-PSL are very pleased to award the Daniel Cohen Prize to Ananya Kotia (PhD student - LSE Department of Economics) for his work exploring how competitive pressure transforms the internal organization of family-managed firms. #PSECEPRPolicyForum Funded by Boussard & Gavaudan and AFPSE

Day 2 #PSECEPRPolicyForum - Policy Conversation on the Future of the International Monetary System with: 👤 Gita Gopinath (@harvard.edu) 👤 Philip R. Lane (@ecb.europa.eu , @cepr.org) 👤Moderated by @talknormal.co.uk (CEPR)

Day 2 #PSECEPRPolicyForum - Gita Gopinath (@harvard.edu): The Third Wave: Addressing Global Imbalances

👩‍🎓 Best wishes Donia Kamel (@pse.bsky.social @sorbonneparis1.bsky.social) who will defend on Wednesday her thesis entitled "Where You Stand: Essays on Race, Identity, and Educational Choice" under the supervision of Hillel Rapoport 🍀 www.parisschoolofeconomics.eu/en/persons/d...

👩‍🎓 Best wishes Lucas Perez (@pse.bsky.social @sorbonneparis1.bsky.social) who will defend on Monday his thesis entitled "Three Essays on the Economics of Air Pollution and Health" under the supervision of Hélène Ollivier and Geoffrey Barrows 🍀 www.parisschoolofeconomics.eu/en/persons/l...

👩‍🎓 Best wishes to Eric Teschke (@pse.bsky.social @sorbonneparis1.bsky.social) who will defend on Tuesday his thesis entitled "Essays on Poverty Dynamics, Targeting, and Governance in Developing Countries" under the supervision of Luc Behaghel and Karen Macours🍀 urls.fr/dE6mKv

Day 1 #PSECEPRPolicyForum - Policy Conversation on International Trade in Turbulent Times with: 👤 @pantras.bsky.social (@harvard.edu , @cepr.org ) 👤 Beata Javorcik (@ebrd.bsky.social ‬, CEPR) 👤 Moderated by @talknormal.co.uk (CEPR)

Day 1 #PSECEPRPolicyForum - @pantras.bsky.social (@harvard.edu, @cepr.org): The Remains of the Trade: The U.S.–China Trade War and Its Aftermath

Day 1 #PSECEPRPolicyForum - Isabelle Méjean (@sciencespo.bsky.social, @cepii-paris.bsky.social, @cepr.org): Trade Policy under Geopolitical Stress

📅 The PSE-CEPR Policy Forum opens today at PSE! 2 days of key debates on the international trade in turbulent times and the future of the international monetary system. Let’s get started. @cepr.org #PSECEPRPolicyForum #Econ

👩‍🎓 Best wishes to Maëlle Stricot ( @pse.bsky.social @sorbonneparis1.bsky.social) who will defend on Wednesday her thesis entitled "Violence Against Women" under the supervision of Thomas Breda and Camille Hémet 🍀 www.parisschoolofeconomics.eu/en/persons/m...

🌍 La transition environnementale peut-elle être à la fois efficace et équitable ? Comment évaluer l’impact des politiques climatiques, énergétiques ou de biodiversité ? 📅 Dès le 24 juin, l’Initiative PSE Environnement met en lumière les travaux de nos économistes.

🧑‍🎓Best wishes to Daniel Sanchez Ordonez (@pse.bsky.social @ehess.fr) who will defend on Monday his thesis entitled "Essays on Land Conflict, Productivity, and Inequality" under the supervision of Facundo Alvaredo 🍀 www.parisschoolofeconomics.eu/en/persons/d...

📖 New #PolicyBrief! "Measuring economic warfare: where does the research stand?" by Sandra Poncet. Within the framework of the Globalization Chair. www.parisschoolofeconomics.eu/en/publicati...

🏆 PSE & ENS-PSL are pleased to announce the #DanielCohenAward 2026 winner: Ananya Kotia, PhD student at LSE, for his Job Market Paper "When Competition Compels Change: Trade, Management, and Productivity". 🔗 shorturl.at/Dws8D

📢 Join us for our next #LunchSeminar with Ilyana Kuziemko ( @princeton.edu & @nber.org ) discussing the hidden finances of young Americans. 🗓️ June 12 | 12 pm (CET) 📍 @pse.bsky.social & Zoom 🔗 Register here: taxobservatory.world/event/lunch-...

#FridayReading 📚 In this book, Denis Cogneau, professor at PSE and at @ehess.fr, makes a major contribution to our understanding of imperialism, past and present by examining both the evolution of colonized societies and what has become of them after independence. ➡️ shorturl.at/L9ZYO

🧑‍🎓Best wishes to Lucie Dehouck ( @pse.bsky.social @sorbonneparis1.bsky.social) who will defend on Friday her thesis entitled "Climate change and water access: household adaptation in Sub-Saharan Africa" under the supervision of Katrin Millock 🍀 www.parisschoolofeconomics.eu/en/persons/l...

👋 Ouverture des inscriptions pour la traditionnelle conférence budget annuelle 📆 15 juin à 14h 📍 Amphithéâtre Daniel Cohen PSE ▶️ Le programme détaillé : www.ipp.eu/actualites/c... ▶️ S'inscrire : bit.ly/4nVHIzm @i-mip.eu @pse.bsky.social @cepremap.bsky.social @crestumr.bsky.social

#FridayReading 📚 In this new book, Luc Arrondel, PSE Professor and @cnrs.fr Senior Researcher, and Richard Duhautois shed light on the economic drivers of modern soccer and debunk common misconceptions about a sport that has become a global industry. ➡️ shorturl.at/QM7WT

@tanguylefur.bsky.social (Master ETE 2015) receives the 2026 Carine Nourry Thesis Prize from @amse-aixmarseille.fr for his article on natural resources and the Great Divergence, published in the Journal of Economic Growth. → www.parisschoolofeconomics.eu/en/news/tang...

📢 Call for Papers | PSE Macro Days 2026 Submissions are open for the 2026 edition of the PSE Macro Days (September 17-18) 📧 To submit, please send a pdf of your paper at [email protected] ⏰ Deadline: May 30 Decisions will be made by June 10 ➡️ www.parisschoolofeconomics.eu/en/news/call...

🧑‍🎓Best wishes to Juan Ignacio Mercatante (@pse.bsky.social @ehess.fr) who will defend on wednesday his thesis entitled "Essays on Energy Transition in a Developing Country: The Case of Argentina" under the supervision of Facundo Alvaredo and Maria Priscila Ramos🍀 urls.fr/QprC7x

📖 New #PolicyBrief! "Exchange Rates, Markups and Inflation: Evidence from Colombia" by Sandra Poncet. Within the framework of the Globalization Chair. www.parisschoolofeconomics.eu/en/publicati...

🧑‍🎓Best wishes to Léo Jean ( @pse.bsky.social | ENS PSL) who will defend on wednesday his thesis entitled "Essays on Climate Policy and Heterogeneous Oil Resources" under the supervision of Fanny Henriet 🍀 www.parisschoolofeconomics.eu/en/persons/l...

👨‍🎓 Best wishes to Pierre Bardier (@pse.bsky.social ENS PSL) will defend on Friday his thesis entitled "Essais en théorie de la décision (collective)" under the supervision of Marc Fleurbaey 🍀 www.parisschoolofeconomics.eu/en/persons/p...

📢 Registration is still open for the 2026 PSE-CEPR Policy Forum. Theme: "Globalization at the Crossroads" Focus: international trade & the future of the global monetary system. 📅 June 18–19, 2026 📍 Paris School of Economics 📝 Register: shorturl.at/SVZnv @cepr.org

🏆Congrats to Sylvain Carré (Master APE 2011) for receiving the 2026 EIF – SCOR Foundation Prize for Best Young Researcher in Finance and Insurance, jointly with Roxana Dumitrescu (ENSAE). 🔗 Read more: www.parisschoolofeconomics.eu/en/news/sylv... #EIFAwards #PSE

🎓 Applications for the Daniel Cohen Award 2026 are now open. ➡️ Submissions are open to thesis supervisors, department heads, or researchers who know the candidate well. → Access the application details here: shorturl.at/FBxfT #PSECEPR #Economics #Research

🏆 Congrats to @adrienbilal.bsky.social (Master APE 2014) on winning the 2026 Best Young Economist Prize from @lemonde.fr & @cercleeco.bsky.social! Mathilde Muñoz (PhD 2022) also received a nomination. → Read more: shorturl.at/CUEko #BestYoungEconomist #PSE #Economics

Next up at the #LunchSeminar: Jeanne Bomare (LSE) “Death and Taxes: Inheritance Tax Planning and Unexpected Mortality” 🗓️ April 3 | 12:00 📍 @pse.bsky.social or via Zoom More info about the seminar ⤵️ taxobservatory.eu/event/eu-tax...

📢 The 2024-2025 Annual Report of PSE is now available! A year of impactful research, academic excellence, and strong partnerships—discover the key insights from Paris School of Economics. 🔗 Read more: www.parisschoolofeconomics.eu/en/news/the-... #PSE #Economics #Research

#FridayReading 📚 This new book, edited by Claudia Senik, PSE Chaired Professor & Director of the CEPREMAP, explores how truths & beliefs are formed today, highlighting the social, political, & digital forces shaping our convictions in the 21st century. ➡️ shorturl.at/Y18jD

🧑‍🎓Best wishes to Samy Zitouni ( @pse.bsky.social @sorbonneparis1.bsky.social) who will defend on Thursday his thesis entitled "Politiques d’atténuation dans le secteur résidentiel français" under the supervision of Carine Staropoli 🍀 urls.fr/N-Vujv

🎓 Today marks the 2026 Prix Turgot ceremony. Two PSE alumni are in the spotlight: 🏆 @mathildeviennot.bsky.social, awarded the Prix du jeune auteur/développement durable 📚 Céline Antonin, nominated for the Grand Prix Turgot #PSEAlumni #Economics #Prize #PrixTurgot

📊 Et si on comprenait enfin la dette publique ? Le 27 mars, PSE organise une conférence #Ecopourtous pour lycéens et étudiants de CPGE avec Éric Monnet et Martin Kessler. 👩‍🎓 Inscription via professeur uniquement 👉 Inscrire votre classe : shorturl.at/u8JWO

Next up at the #LunchSeminar: @dhenning.bsky.social ( @ox.ac.uk ) on the distortionary effects of tax audits 📉 🗓️ March 20 | 12:00 📍 @pse.bsky.social or via Zoom More info about the seminar ⤵️ www.taxobservatory.eu/event/eu-tax...

What happens when leading economists and policymakers meet in Paris? Watch the aftermovie of the 2025 [email protected] Policy Forum 🎥 youtu.be/ggSpMq-UkHY The 2026 edition returns on June 18–19 with the theme “Globalization at the Crossroads”: shorturl.at/zSvlJ

👩‍🎓Best wishes to Anna Barbeta Margarit (@pse.bsky.social @sorbonneparis1.bsky.social) who will defend on Thursday her thesis entitled "Essays on Family Institutions and Economic Behavior" under the supervision of Sylvie Lambert and Suanna Oh🍀 www.parisschoolofeconomics.eu/en/persons/a...

📢 Conférence #EcoPourTous : "La dette publique" | 27 mars 2026 🎙️ É. Monnet (PSE, prix du Meilleur Jeune Économiste 2022) 🎙️ M. Kessler (@findevlab.bsky.social, ex-OCDE & Banque mondiale) 👩‍🎓 Ouverte aux lycéens et étudiants de CPGE, uniquement sur inscription via leur professeur 👉 shorturl.at/CgK4I

🎓 Paris School of Economics organise une journée en hommage à Roger Guesnerie, professeur émérite à PSE et professeur honoraire au @college-de-france.fr, après sa disparition le 4 janvier dernier. 🗓️ Mardi 14 avril 2026 📍 PSE - Amphithéâtre Daniel Cohen 🔗 shorturl.at/QNSLw

👨‍🎓 Best wishes to @arturobminski.com (@pse.bsky.social @sorbonneparis1.bsky.social) who will defend on Friday his thesis entitled "Migration and Social Responses" under the supervision of Hillel Rapoport and Ekaterina Zhuravskaya 🍀 www.parisschoolofeconomics.eu/en/persons/a...

📢 Join our next #LunchSeminar! @jamilan.bsky.social ( @heclausanne.bsky.social ) presents the impact of "smart" sanctions on Russian firms (2014-21) & the broader economy, using a natural experiment & data from 2M+ firms. 🗓️ Mar 13 📍 @pse.bsky.social or Zoom 👉 www.taxobservatory.eu/event/eu-tax...

Read the full paper in Nature: www.nature.com/articles/s41... With @pinchofdata.bsky.social, Roland Hodler, and Ekaterina Zhuravskaya @pse.bsky.social @bocconi.bsky.social @unisg.ch

We ran this experiment independently: no platform cooperation, no corporate funding. Instead, it was funded by the Swiss National Science Foundation SNSF.

Important nuances: the algorithm did NOT change party identification or affective polarization over the seven-week study period. It shifted policy views and attitudes on current events, not deep partisan identity.

This is a behavioral lock-in: once you follow new accounts promoted by the algorithm, they stay in your feed regardless of which feed setting you use.

Why this asymmetry? We also found that X's algorithm promotes political activist accounts (especially conservative ones) and demotes traditional news media. In response to algorithm exposure, users follow these accounts and continue to follow them even after switching to the chronological feed.

But here's the twist: switching the algorithm OFF did not reverse the effects. Users who went from algorithmic to chronological feeds showed no significant change in political attitudes. The effects of algorithm exposure are sticky.