Tracking online user behavior is essential for targeted advertising and is at the heart of the business model of major online platforms. We analyze tracker-specific web browsing data to show how the prediction quality of consumer profiles varies with data size and scope. We find decreasing...

This paper examines how the General Data Protection Regulation (GDPR) can be used to address procedural problems faced by platform workers, including opaque rating systems, arbitrary account suspension and nonpayment, and uncommunicative clients and platform operators. GDPR provides workers with...