When a group of people acts together we can hold that group morally and legally responsible. But how does the group decide to act? Is a decision of the group simply the majoritarian sum of individual group members' views? Princeton philosopher Philip Pettit, who has written a book about this topic with Christian List of the LSE, discusses these issues with Nigel Warburton for the Philosophy Bites podcast. Philosophy Bites is made in association with the Institute of Philosophy.