This document discusses the role of open data in cities and the potential for data cooperatives. It notes that while data provides benefits through personalization, individuals may not be in control of their own data. The document suggests data cooperatives as a way for people to take back control of their data through custodianship, representation, and redistributing the value of aggregated personal data in a fair way. Open data initiatives in cities like Manchester aim to make all public data freely available to fuel innovation, but questions remain around empowering all people to benefit from data.