A history of ideas. Presented by Melvyn Bragg but told in many voices. Each week Melvyn is joined by four guests with different backgrounds to discuss a really big question. This week he's asking 'How should we live together?'. Helping him answer it are economist Kate Barker, historian Justin Champion and the philosophers Timothy Secret and Angie Hobbs. For the rest of the week Kate, Justin, Timothy and Angie will take us further into the history of ideas around this question with programmes of their own. Between them they will examine: Adam Smith's idea of the free market; John Locke's prescription for cohesion in a diverse society - Toleration; ideas of ancestor worship as practiced by followers of Confucius; and Plato's idea of the Philosopher Kings - government by the wise. Producer: Melvin Rickarby.