Data donations promise to unlock the social benefits of personal data. Most recently, digital contact-tracing apps have been developed to collect individuals' donated contact and health data to fight the COVID-19 pandemic. As the effectiveness of contact-tracing apps hinges critically on...

Recent high-profile antitrust cases and policy proposals have put a spotlight on the relationship between firms’ access to big data and sustained competitive advantages in digital markets. In Europe, concerns about data-driven market power have led policy makers to propose far-reaching...

This article analyses the crucial role of user data for digital markets contestability and presents policy proposals devised to address growing concerns about the dominance of data-rich incumbents in digital markets. To this end, we discuss a data-driven theory of harm that would warrant ex-ante...