How do big corporations and governments use our data to manipulate our behaviour? Up to what point should this be permitted, and how should regulations deal with actions that end up affecting the realities of our societies? Carissa Véliz (United Kingdom) is an Associate Lecturer at Oxford University’s Institute for Practical Ethics, and a regular contributor to publications including El País, The Guardian, The New York Times, New Statesman and The Independent. In her book Privacy is Power (Transworld, 2020) she analyses these matters, as well as others that are of critical importance to our time, arguing in favour of the prohibition of the sale of personal data. In conversation with Mónica Meltis.