Over the past decades a growing number of countries have offered citizenship or residence in return for a donation or investment. Taking a multi-disciplinary approach to the study of this phenomenon, this open access collection examines its legal, political, and conceptual implications. The volume consists of four parts. The first part documents recent trends in investment migration and seeks to understand its implications for our understanding of the concept of citizenship. The second part provides a legal and normative assessment of investment migration, from the perspective of both EU and international law. The third part presents case studies of investment migration practices in countries from around the world, including from jurisdictions that have so far remained under-researched. The fourth part deals with the specific EU legal-political context and also engages with the case launched by the European Commission against Malta. The book assembles the leading experts in the field and offers a rigorous and balanced analysis of this sometimes controversial field. The ebook editions of this book are available under a CC BY-NC-ND 4.0 licence on bloomsburycollections.com. Open access was funded by Central European University.