This article introduces Citizenship by Investment (‘CBI’) as exceptional municipal legal mechanisms that allow anyone to directly purchase citizenship from a selling state for a substantial monetary contribution. States that sell citizenship assume complete control, expose, and may ultimately give up control over citizenship. CBI simply means ‘cash for passports’ as direct, immediate naturalizations, which heightens mobility and pre-supposes multiple citizenship, without (or with negligible) actual physical residence requirements. CBI is marketed as ‘global citizenship’. It creates a flexible, transactional citizenship, operating within an emerging tripartite nexus of states, citizens, and global markets for citizenship and residence ...