Impact
Citations of my research by regulators, competition authorities and courts, policy consultations, and press coverage:
Policy & Regulatory Citations
-
Decision in the Apple App Tracking Transparency Proceedings August 2026
Bundeskartellamt (German Federal Cartel Office) -
Italian Competition Authority Fines Apple €98.6 Million for Abuse of Dominant Position (App Tracking Transparency) December 2025
Autorità Garante della Concorrenza e del Mercato (AGCM), Italy -
GDPR: What Economic Impact? — Concept Paper October 2025
CNIL (France), Economic Analysis Unit -
Commission Decision on Meta's Non-Compliance with the DMA (“Consent or Pay”) April 2025
European Commission -
Negative Option Rule (“Click-to-Cancel”) October 2024
U.S. Federal Trade Commission -
The Intersection Between Competition and Data Privacy — Note by Poland June 2024
OECD Competition Committee -
Response to the ICO Call for Views on “Consent or Pay” Business Models April 2024
Utrecht University, Chalmers University & Karlstad University, submitted to the UK Information Commissioner's Office (ICO) -
Response to the ICO Call for Views on “Consent or Pay” Business Models April 2024
noyb – European Center for Digital Rights, submitted to the UK Information Commissioner's Office (ICO) -
Étude économique sur les modèles publicitaires alternatifs aux solutions dominantes February 2024
Commissioned by the CNIL
Policy & Regulatory Engagement
-
Targeted Substitute Impact Assessment of the Digital Omnibus Proposal October 2026
Expert consultation for the European Parliamentary Research Service (EPRS), at the request of the Committees on Civil Liberties, Justice and Home Affairs (LIBE) and on Industry, Research and Energy (ITRE)
Cited in Litigation
-
Declaration of Professor Robert Zeithammer in Support of Class Certification 2025
In re Google RTB Consumer Privacy Litigation, N.D. Cal. -
Brief of Internet and Consumer Law Professors as Amici Curiae Supporting the FTC March 2025
Custom Communications, Inc. v. FTC, U.S. Court of Appeals for the Eighth Circuit -
Expert Class Certification Report of Professor Robert Zeithammer 2023
In re Google RTB Consumer Privacy Litigation, N.D. Cal.
Press Coverage
-
Automatic Renewal Can Cost Subscription Firms Subscribers September 2026
HEC Paris DARE -
The Polarization Trap: Partisan Content Drives Engagement, Not Subscriptions June 2026
Marketing Science Institute (MSI) Research Recap -
Why Your Best Subscription Retention Strategy May Be Costing You Customers June 2026
Forbes -
Should Your Subscription Business Use Auto-Renew? May 2026
Harvard Business Review
with Z. John Zhang -
Polarising Content Reduces Subscription Likelihood March 2026
Bonn Institute Newsletter -
Modèles d’affaire des médias : le piège de la polarisation February 2026
Minted -
Who Will Win the Tug-of-War Between Europe and Big Tech? February 2026
HEC Paris DARE -
Polarising News is a Trap for Reader-Funded Media January 2026
INMA (International News Media Association)
Research coverage by Greg Piechota -
Data in Advertising: Risks and Benefits December 2025
HEC Stories #26 Yearbook -
Why Bosses Need to Wake Up to Dark Patterns October 2025
The Economist -
GDPR: What Economic Impact? October 2025
Commission Nationale de l'Informatique et des Libertés (CNIL) and Directorate General of the Treasury
Academic conference with Philippe Aghion (Nobel Prize in Economics 2025) -
Auto-Renew Snags New Subscribers, but It's Not a Good Way to Keep Them 2025
Stanford Insights -
Why Locking in Subscribers Is Bad Business 2025
Chicago Booth Review -
Sophisticated Consumers with Inertia 2025
Becker Friedman Institute, University of Chicago -
Auto-Renew Exploits Inertia, Hurts Long-Term Profits 2025
Knowledge@HEC -
Proposer des abonnements automatiques après essai: une stratégie perdante pour les entreprises 2025
The Conversation -
Automatic Subscription Renewals 2025
Futurity -
Are You in Control of Your Subscriptions? April 2025
HEC DECODING -
The Impact of the GDPR on Online Tracking 2025
Knowledge@HEC -
Pay or Okay Report 2025 July 2025
noyb – European Center for Digital Rights
On: Paying for Privacy: Pay-or-Tracking Walls -
Privacy-Enhancing Technologies in Adtech and Consumers’ Perceived Privacy Violations July 2024
TechREG Chronicle, Competition Policy International
On: Consumers’ Perceived Privacy Violations in Online Advertising -
Cookies Are Worth More Than You Think 2024
Harvard Business Review (Nov–Dec 2024, Print Edition)
with Bernd Skiera -
Data in Advertising: How to Manage the Risks and Benefits? 2024
HEC Paris -
AI in Online Advertising September 2024
CGTN Europe, Global Business -
Privacy Research Day 2024 June 2024
Commission Nationale de l'Informatique et des Libertés (CNIL) -
What a Future Without Browser Cookies Will Look Like 2024
Computerworld -
Cookies Worth More Than You Think 2024
Cybernews -
Wie wertvoll ist ein Cookie? 2024
Horizont -
Internet Cookies: Over Half Their Value Comes From Basic Identifiers 2024
Digital Information World -
Pubblicità online: la vita dei cookie e il delicato equilibrio tra privacy e profitto 2024
Agenda Digitale -
Up Next Podcast 2024
Adweek Best Marketing Podcast -
The Economic Impact of Cookie Lifetimes on Online Tracking 2024
Knowledge@HEC -
Power of Cookies: Talk with Klaus Miller 2024
IJRM Newsletter -
Consumers' Perceived Privacy Violations in Online Advertising 2024
Datagrail -
Consumers' Perceived Privacy Violations in Online Advertising 2024
Ad Exchanger -
Consumers' Perceived Privacy Violations in Online Advertising 2024
Cornerstone Research -
Academics Shower FTC With Ideas on Where Privacy Enforcement Should Head 2024
Corporate Counsel (Law.com)
On: Paying for Privacy: Pay-or-Tracking Walls -
Ad Blockers and News Consumption 2022
Adguard -
Ad Blockers' Effect on News Consumption 2022
Data Skeptic Podcast -
Meta and Data Privacy: a Clash of Cultures and Generations? February 2022
Knowledge@HEC -
Facebook, Tech Peers, Face Ad Crunch from European Rules April 2018
S&P Global Market Intelligence -
Limiting Cookie Lifetime Will Destroy Value 2017
Into the Minds Blog -
Kommt die Diktatur der Daten? 2017
Planung & Analyse Online